Each slice of this easy egg breakfast casserole is thick, flavorful, and satisfying; plus, the recipe is an incredibly convenient breakfast choice since it’s make-ahead and infinitely adaptable. Like quiche and breakfast egg muffins, you can use your favorite seasonings and cheeses, vegetables like peppers and mushrooms, meats like sausage or bacon, or you can make it vegetarian. The best part is that you can assemble this dish ahead of time so breakfast is a breeze in the morning!
I originally published this recipe in 2015 and have since added new photos, a video tutorial, and more helpful success tips. I’ve also simplified the recipe instructions.
Breakfast casserole is an all-in-one hearty meal that can be made ahead of time, feeds a crowd, reheats well, and makes great leftovers. My family devours it. For all these reasons and more, I’ve made it nearly 100x (no exaggeration there) for breakfast, brunch, and, yes, dinner. It’s one of my favorite Easter brunch recipes to serve each year, too.
Let me show you how it comes together so you too can experience this crowd-pleasing superhero meal.
One reader, Mary, commented: “Love it! It is literally the perfect recipe. I’ve made it a few times now and everyone loves it, including my in-laws. We’ve made it for a crowd and also done it for the week as a meal prep for my husband and I. We love that it’s all in one (protein, veggies, carbs, etc.), easy to make, and can be made ahead. I cannot recommend this recipe enough! ★★★★★“
This Easy Breakfast Casserole Is:
- Adaptable to whatever vegetables, meats, cheeses, and herbs you have on hand.
- Easy to make ahead of time.
- Quick to throw together.
- Great as a quick weekday meal or a lavish weekend or holiday brunch.
- Excellent for entertaining a crowd.
- Made with some bread to soak up moisture, but potatoes work too!
- Ready for your favorite egg toppings like salsa, pico de gallo, green onion, cilantro, parsley, avocado, everything bagel seasoning, hot sauce, etc.
4 Main Components
When gathering ingredients for this recipe, I like to think of it as having 4 separate components. From there, you can have fun with variations.
- Vegetables
- Meat (or extra vegetables)
- Starch for soaking up moisture
- Egg, cheese, & milk mixture
Here Are the Endless Add-ins & Flavor Options
- Vegetables: Select which vegetables you’d like in the dish. Generally, the most popular with guests is bell peppers, spinach, and mushrooms. But I’ve also made this with broccoli/peppers, kale/mushrooms, and spinach/zucchini. Try to stick to 3–4 cups of vegetables total. Cook the vegetables down with some flavor-enhancing onion and garlic.
- Meat: Guests usually prefer meat in the casserole, so I add sausage. Or try using ground turkey, chopped bacon, ground beef, or ground chicken. I usually purchase uncooked sausage for this and brown it with some dried rosemary or Italian seasoning to give it a little extra flavor, but that is optional. If the meat you’re using is pre-cooked, such as chopped ham or shredded chicken, you can mix it with the cooked vegetable mixture before layering it into the dish.
- Starch: Like when making sausage & herb stuffing, breakfast strata, and French toast casserole, the bread should be slightly stale so it can soak up moisture. Crusty sourdough or homemade ciabatta bread are FANTASTIC here. You can also use homemade artisan bread, seeded oat bread, whole wheat bread, a loaf of French bread, crusty baguette, biscuits, bagels or homemade bagels, or even day-old croissants (have you tried homemade croissants?!). To make it gluten free, use gluten-free bread or potatoes.
- Eggs, milk, & cheese: Whisk a dozen eggs with a little half-and-half or milk and stir in some shredded cheese. Like the vegetables and meat, use whatever cheeses you like best, such as sharp cheddar, pepper jack, feta, and/or smoked gouda.
Variations: One of my favorite variations of this recipe is everything bagel breakfast casserole. It’s a BIG HIT and consistently gets rave reviews. Or try my different method/recipe for biscuit breakfast casserole with homemade biscuits baked right on top.
Can I Use Potatoes?
Yes, you can replace the bread with diced hash brown potatoes—the kind you find in the freezer section of the grocery store. Guests have *loved* this version. Use about 3 cups (around 380g) of hash browns in place of the bread. You could also peel and dice fresh potatoes, but you’ll need to quickly cook them on the skillet for 10 minutes before using in this dish.
Another wonderful make ahead option with fresh potatoes is this ham and potato casserole that is egg free, but just as delicious.
Do I Have to Use Bread?
Bread or potatoes, yes. Besides eggs, bread is the main ingredient. To avoid a spongey, wet dish, this breakfast casserole needs structure at the bottom. You see, when eggs bake, they release a lot of liquid. Chunks of crusty bread (or hash brown potatoes) soak up some liquid so the casserole is chunky and textured, not flat and wet. It’s almost like the way we need an English muffin with our eggs benedict—to help soak up all that eggy goodness.
If you’re looking for something without this starchy addition, crustless vegetable quiche or an easy frittata are great options.
In Pictures: How to Make Breakfast Casserole
First, place the pieces of bread (or potatoes) in the bottom of a greased 9×13-inch or any 3–4-quart oven-safe dish. I usually use (affiliate links) this glass pan or the pictured red ruffled baking dish, which comes in a set with other sizes—definitely a splurge, but I’ve found the quality to be excellent. Showing you the bread scattered in the pan as well as the optional potato substitution:
Set that aside and pre-cook your vegetables and meat (if the meat is not cooked already). You can do this all in 1 big skillet on the stove, adding onion, garlic, and optional herbs like dried rosemary or your favorite seasoning blend. As that’s sizzling on the stove, whisk the eggs, milk, and cheese together:
Now it’s time to assemble, and I’ve made this process a lot easier over the years. Spoon all of the vegetables/meat mixture on top of the bread. Pour the egg mixture all over that:
Success Tip: Refrigerate Overnight
At this point, you can either bake it right away or refrigerate the casserole overnight and for up to 24 hours. During this time, the flavors mingle together and the bread has a chance to soak up some of the liquid and flavor. Wake up and all you have to do is slide it into the oven. If you’re in a rush, I do recommend at least 30 minutes in the refrigerator before baking, if you can spare it!
Bake until the edges are golden brown. Because it’s so egg heavy, the casserole puffs up in the oven like a cheesecake and then sinks back down as it cools. Cool for 5–10 minutes before slicing and serving.
What to Serve With Breakfast Casserole
For side dishes, fresh fruit and yogurt are light, simple, and quick. For healthy recipe ideas, see my complete list of 30+ healthy breakfast recipes. However, if you’re entertaining—or if you have several hungry teenagers in your house— you’ll love pairing this breakfast casserole with:
- Easy Cinnamon Rolls
- Slow Cooker Cinnamon Rolls
- Maple Chicken Breakfast Sausage
- Pumpkin Cinnamon Rolls or Pumpkin Crumb Cake
- Banana Muffins or Blueberry Muffins
- Baked Oatmeal
- Sour Cream Coffee Cake
- Banana Bread or Zucchini Bread
- Apple Cider French Toast
- Dark Chocolate Raspberry Coffee Cake, a Cinnamon Roll Wreath, or Cranberry Cake (great options around the holidays)
- A Dutch baby piled high with your favorite sweet toppings
- Or any other of my make ahead breakfast ideas!
Your brunch guests will be beyond satisfied. Yes, even the teenagers!
Print
Easy Make-Ahead Breakfast Casserole
- Prep Time: 20 minutes
- Cook Time: 45 minutes
- Total Time: 1 hour, 30 minutes
- Yield: serves 12
- Category: Breakfast
- Method: Cooking
- Cuisine: American
Description
This easy breakfast casserole is infinitely adaptable and you can find variations and suggestions in the recipe Notes below. The version written below with sausage, mushrooms, bell peppers, spinach, and cheddar cheese is generally the most popular with guests. You can assemble the entire dish and refrigerate for up to 24 hours before baking.
Ingredients
- 4 cups (175g or 6 oz) cubes of crusty bread*
- 1 teaspoon olive oil
- 1 pound ground pork sausage, casings removed*
- 1 teaspoon dried rosemary or Italian seasoning, optional
- 3/4 cup (100g) chopped yellow onion (1/2 of a large onion)
- 2 garlic cloves, minced
- 2 cups (275g or 9–10 oz) chopped bell peppers
- 1 cup (100g or 3 oz) sliced mushrooms
- 1 cup roughly chopped fresh spinach
- 12 large eggs
- 1/4 teaspoon salt
- 1/8 teaspoon freshly ground black pepper
- 2/3 cup (160ml) milk or half-and-half*
- 1 cup (100g or 3.5 oz.) shredded cheddar cheese
- optional garnish: green onion and/or chopped parsley
Instructions
- Grease a 9×13-inch or any 3–4-quart oven-safe dish. Arrange bread cubes in an even layer in bottom of pan.
- Heat olive oil in a large skillet over medium heat. Add sausage and rosemary/Italian seasoning, if using, and break up the sausage into bite-size pieces with a wooden spoon or rubber spatula as it begins to cook. Add the onion, garlic, peppers, mushrooms, and spinach and cook until everything has slightly softened and sausage is mostly cooked through, about 5–6 minutes.
- Remove sausage and vegetable mixture from heat and spread in an even layer on top of bread.
- Whisk the eggs, salt, pepper, milk, and cheese together. Evenly pour over sausage/vegetable mixture. Add another sprinkle of salt and pepper on top.
- Cover casserole with plastic wrap or aluminum foil and refrigerate for at least 30 minutes and up to 24 hours. (When ready to bake, allow to sit at room temperature for 10–15 minutes as oven preheats.)
- Preheat the oven to 375°F (191°C). Bake the casserole, uncovered, until the top is golden, edges are crisp, and a toothpick inserted in the center comes out clean, about 40–45 minutes.
- Cool for 10 minutes, then slice and serve.
- Leftovers keep well in the refrigerator for up to 5 days. Reheat in the microwave to your liking.
Notes
- Make Ahead Instructions: This is an excellent make-ahead recipe because you can assemble it before baking up to 24 hours in advance. See step 5. You can also cook the sausage and vegetable mixture up to 24 hours in advance, cover and refrigerate until ready to use.
- Freezing & Reheating Instructions: To freeze, prepare and assemble through step 5, cover with plastic wrap, then a layer of aluminum foil, and freeze for up to 3 months. Thaw overnight in the refrigerator, and then bring to room temperature before baking as directed. You can also freeze the baked casserole for up to 3 months and when doing that, I suggest baking it in a disposable aluminum pan. Cool completely, cover with plastic wrap, then a layer of aluminum foil. When ready to eat, thaw it for about 24 hours (covered) in the refrigerator, remove the plastic wrap layer, then bake in a 350°F (177°C) oven for 25–30 minutes.
- Special Tools (affiliate links): 9×13-inch Baking Dish or any 3–4-quart Oven-Safe Dish | Glass Mixing Bowls | Whisk
- Bread: Crusty sourdough is fantastic in this recipe, or use any crusty, hearty bread. The crustier or more stale, the better. If your bread is fresh and/or flimsy, cut into cubes and bake on a baking sheet in a 300°F (149°C) oven for 10 minutes. It’ll be slightly crisp and ready to use in this recipe. No need to wait for the bread to cool before layering into the baking dish.
- Using Potatoes Instead of Bread: You can replace the bread with diced hash brown potatoes—the kind you find in the freezer section of the grocery store. Use about 3 cups (around 380g) of frozen hash brown potatoes, no need to thaw. You could also peel and dice fresh potatoes, but you’ll need to quickly cook/brown them on a skillet with 1 Tablespoon olive oil over medium heat for 10 minutes before using.
- Sausage or Other Meat: If using pre-cooked sausage links or ham, cut into slices/chunks, and there is no need to cook either. Simply stir into the pre-cooked vegetables before layering into the dish. You can replace the sausage with ground turkey, beef, or chicken—simply pre-cook with the vegetables according to the instructions. If using bacon, I recommend reducing to 1/2 pound and cutting into bite-size pieces. Cook separately from the vegetables until browned. Drain, then mix with the vegetables before layering into the dish.
- Other Vegetables: Feel free to replace all or some of the bell peppers, mushrooms, and spinach with other vegetables such as chopped broccoli, sliced zucchini or squash, or kale. Pre-cook as directed.
- Vegetarian Option: You can leave out the meat and replace with another 1 cup of vegetables.
- Milk: For the richest, heartiest texture, I recommend half-and-half or whole milk. You can use lower-fat milk or dairy-free milk if desired.
- Cheese: I usually use a blend of regular and sharp white cheddar cheeses. Use whatever cheeses you like best, such as pepper jack, feta cheese, Swiss, and/or smoked gouda.
- Half Recipe: You can halve this recipe by halving all of the ingredients and using a 9×9-inch square pan. Bake time is slightly shorter, about 32–36 minutes.
Nutrition
- Serving Size:
- Calories: 212
- Sugar: 3.1 g
- Sodium: 343 mg
- Fat: 12.8 g
- Carbohydrates: 11.2 g
- Protein: 12.5 g
- Cholesterol: 205.4 mg
Reader Comments and Reviews
I always have some trepidation with new recipes but this one was so forgiving
I read it a few times and followed the basic format. My family loved it. They wanted to know where I got it and who was Sally! (I told them Sally had never steered me wrong. )
Thank you ! This was easy as promised.
I am so much more a baker than a cook.
So happy to hear that this recipe was a success for you, Linda!
Why can’t I access the comments – when I click on comments it just takes me to this area. I want to read comments – it helps me as a new baker.
Hi JC, the comments section seems to be working on tablet, mobile, and desktop. If you scroll down to where you can leave a comment, you will find reviews/comments/questions from others.
Hi Sally… I’m obsessed with your site and have made dozens of your exceptional recipes… Thank you!! For this recipe could the mixture be divided into muffin tins? If so how many do you think it would make and how log to bake?
Hi Susan! Thank you so much. You can absolutely turn this breakfast casserole into egg muffins. I would say it makes at least 2 dozen. (Though probably more!) Follow the same baking instructions as my egg frittata muffins.
Would tater tots work well in this recipe?
Hi Peggy, we haven’t personally tested it, but some readers have reported they tried it and it turned out great for them!
Great recipe! Thank you! I love that you added other options, how to store, and how to make a half recipe.
Hello, I noticed you did not suggest diced tomato as an option, is that because they will cook down or they will create moisure? Thanks!
Hi Monica, tomatoes work well here! We use them in our everything bagel breakfast casserole. If they seem especially wet after dicing, you may want to gently pat them with a paper towel to rid of some of the excess moisture. Hope you enjoy the casserole!
I forgot to grease my pan is it completely ruined?
Hi Dominique, it may stick a bit, but a good soak will help when cleaning up!
I hope you see this! I accidentally used fresh bread (but it did sit out chopped up for half an hour!) and then I noticed when I poured the egg mix, I couldn’t see any at all. Seemed like it has all soaked up…should I have used more egg mixture? How does it get puffy if all the egg mix is gone? This is for breakfast tomorrow with in-laws and now I’m panicking 🙁 should I have a backup breakfast?
Hi Sarah, crusted bread really is the key for the best taste and texture. Let us know if you give it a try again!
Super-tasty, I made it to serve for a co-worker’s birthday. It was very transport-able, and as it had cooled off, the perfect sliceable composition for anyone to reheat squares of it in the office microwave.
I made two casseroles, one with diced jalapenos plus some of the juice for the spicy-food lovers, and one without. Both had a combo of bread cubes/potatoes in the bottom, it made a perfectly stable bottom for the egg mixture to seep into then solidify when cooked. Well done, it’s only been on the lunchroom table for a brief time and I’ve already had a request for the recipe. I gave them your link, of course. 🙂
(quick confession, I did up the cheese to an entire 3 cup bag of sharp cheddar and needed 2 cups of milk for the desired ‘fullness’)
Hi, can I do this in a muffin tin instead (for more of a grab-and-go option)?
Thanks!
Hi Meghan! You can definitely make this as individual servings in a muffin tin.
Hi there, this was my question as well. Wondering approximate time if made in a muffin pan. Thanks!
Just adding my rating!
I made this Sunday for brunch at my parents then made it Monday for my family. Quite a hit. Everyone loved it. I used shredded hash browns instead of bread both times as I have people who can’t eat gluten. I ended up adding 2 extra eggs to make it more eggy. Delicious!
If you are using potatoes instead of bread, do I still need to have it sit overnight or can I bake it right away?
Hi Sharon, yes, we’d still recommend letting the casserole sit overnight. Enjoy!
I let it sit like 30 minutes and it was totally fine.
Hi. Can i use seasoned croutons (the kind you put on salads) instead of bread?
Hi Scott, we haven’t tested it, but if the croutons are on the larger side, that should work. Please do let us know if you try it!
Can I use croissants instead of bread? If so how many?
Absolutely. It depends on how large the croissants are, so I can’t give an accurate count. You’ll want 6 ounces of them.
Forgot to add a rating on my previous comment! 5 stars ⭐️
I followed the recipe except for adding the mushrooms as my husband doesn’t like them. I cubed up leftover croissants and “everything” bagels for the bread, it was a great way to use them up! Delicious casserole!!! I will definitely be saving the recipe to use again! Thanks!
I made this for Easter brunch. I used potatoes(shredded hash browns) it looked good but there was very little flavor. The egg mixture wasn’t absorbed completely by the potatoes and there was an egg “puddle “ in the bottom of the pan. I followed the directions exactly. Don’t know what happened. Everyone really liked it and had seconds. Maybe it was the potatoes. Any ideas? Thanks
Hi Geri! All the egg won’t be absorbed. Could the casserole have been under-baked?
I wonder if the version using potatoes in lieu of bread might work better without the half & half or milk? Seems like the liquid would not be necessary.
I’m planning on making this for brunch. What size are the bread cubes supposed to be?
Hi Denise, about an inch or so—they don’t all have to be exactly uniform. Hope it’s a hit!
Thank you I appreciate your e mails I receiving…I am baking this casserole now but I used ground Turkey as a substitute
.hopefully it will be delightful ..I am looking forward to again baking breads ..I really liked you step by step for baking bread and understanding yeast
God Bless You !
It was so delicious and I’m making it again to take to Easter brunch.
Im wondering, I wanted to assemble this Thursday evening and take to cottage to bake Saturday morning..is that too long? Maybe I should make the components separate and combine them once I arrive on Friday then bake Saturday?
Hi Lawney, yes, we do not recommend letting the casserole any longer than 24 hours. You can certainly make the components separately and then assemble, or see recipe Notes for freezing instructions.
If I use frozen hash brown diced potatoes, as the recipe note suggests, can I still prep this ahead of time. Or would having the frozen potatoes sit in the egg mixture overnight mess with the texture. Hoping to prep this overnight to make for Easter brunch. I’m making a sweet breakfast casserole that uses croissants so I wanted to use potatoes in this one for variety. Thanks for any guidance!
Hi Ann, yes, you can still prepare the overnight version with the frozen hash brown diced potatoes. Hope it’s a hit!
Question please: I’m looking to make this and your Unbelievable Blueberry French Toast Casserole one day ahead and bake at the same (one oven). This bakes at 375 and the blueberry casserole bakes at 350. What temp should I use to bake them both at the same time? & how should I adjust the cooking time for the one that’s at a different temp? Many thanks! Love your recipes!
Hi JB, you can bake this at 350 degrees if needed. We’re unsure of the exact bake time, but it will take bit longer. Keep an eye on it and bake until the top is golden, edges are crisp, and a toothpick inserted in the center comes out clean.
I used butter to grease the casserole dish seasoned the potatoes lightly before adding the cheese. I choppedca green pepper, a small yellow onion as well as a lb of cut up hamsteak. I also added an extra egg. I served it at a family brunch and the loved it.
I’ll be making another version of this. Maybe a Ranchero variation. This is very versatile.
This is one of my very favorite recipes!! I use it for all weekend guests. Do you think I could use gluten free bread for a gluten free guest?
Hi Jenna, we imagine gluten free bread should work just fine here!
My husband can’t have gluten and usually prefers the hash brown substitute to the gluten-free bread…and it’s a lot cheaper! The gluten-free bread doesn’t always behave like regular bread in recipes.
can you use frozen shredded hashbrowns for this recipe?
Hi KJ, Some readers have used shredded hash browns with success. We usually use the diced frozen hash brown potatoes mentioned in the Notes.
What do you think if I used frozen french fries instead of bread or hash browns?
Hi Paul! It may get a little greasy/mushy, but we haven’t tested it. Let us know if you do!
Thank you for the great recipe. I have made this a few times now and it’s been a big hit!
Recipe is very good. This time I would like to substitute frozen potatoes. Would I have to cook it longer? I want to make one of your muffins to go with it. Thank you.
Hi Phyllis, you can use about 3 cups (around 380g) of frozen hash brown potatoes, no need to thaw. Bake time should be just about the same.
Loved it! Thank you. I used a chicken sausage and thinly sliced red sausage links. I also whisked a little sour cream in with egg mixture and it was delicious!
The recipe turned out fantastic. It did take a little longer to cook. I swapped fresh broccoli for the spinach. My friends loved it and asked for the recipe. Thanks to all for all the great recipes.