Easy Breakfast Casserole Recipe - Sally's Baking Addiction (2024)

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!

Easy Breakfast Casserole Recipe - Sally's Baking Addiction (1)

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.

I originally published this recipe in 2015 and have simplified it over the years. Let me show you how it comes together so you too can experience this crowd-pleasing superhero meal.

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.
Easy Breakfast Casserole Recipe - Sally's Baking Addiction (2)

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.

  1. Vegetables
  2. Meat (or extra vegetables)
  3. Starch for soaking up moisture
  4. Egg, cheese, & milk mixture

Here Are the Endless Add-ins & Flavor Options

  1. 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.
  2. 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.
  3. Starch: Like when making , breakfast strata, and French toast casserole, the bread should be slightly stale so it can soak up moisture. Crusty sourdough is 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.
  4. 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.

Easy Breakfast Casserole Recipe - Sally's Baking Addiction (3)

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:

Easy Breakfast Casserole Recipe - Sally's Baking Addiction (4)

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:

Easy Breakfast Casserole Recipe - Sally's Baking Addiction (5)
Easy Breakfast Casserole Recipe - Sally's Baking Addiction (6)

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:

Easy Breakfast Casserole Recipe - Sally's Baking Addiction (7)
Easy Breakfast Casserole Recipe - Sally's Baking Addiction (8)

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.

Easy Breakfast Casserole Recipe - Sally's Baking Addiction (9)
Easy Breakfast Casserole Recipe - Sally's Baking Addiction (10)
Easy Breakfast Casserole Recipe - Sally's Baking Addiction (11)

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
  • 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)

Your brunch guests will be beyond satisfied. Yes, even the teenagers!


Easy Breakfast Casserole Recipe - Sally's Baking Addiction (12)

Easy Make-Ahead Breakfast Casserole

5 Stars4 Stars3 Stars2 Stars1 Star4.9 from 70 reviews

  • Author: Sally
  • Prep Time: 20 minutes
  • Cook Time: 45 minutes
  • Total Time: 1 hour, 30 minutes
  • Yield: serves 12
  • Category: Breakfast
  • Method: Cooking
  • Cuisine: American
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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.


  • 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 910 oz) chopped bell peppers
  • 1 cup (100g or 3 oz) sliced mushrooms
  • 1 cup roughly chopped fresh spinach
  • 12 large eggs
  • 1/4 teaspoonsalt
  • 1/8 teaspoonfreshly groundblack 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


  1. Grease a 9×13-inch or any 3–4-quart oven-safe dish. Arrange bread cubes in an even layer in bottom of pan.
  2. 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.
  3. Remove sausage and vegetable mixture from heat and spread in an even layer on top of bread.
  4. Whisk the eggs, salt, pepper, milk, and cheese together. Evenly pour over sausage/vegetable mixture. Add another sprinkle of salt and pepper on top.
  5. 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.)
  6. 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.
  7. Cool for 10 minutes, then slice and serve.
  8. Leftovers keep wellin the refrigerator for up to 5 days. Reheatin the microwave to your liking.


  1. 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.
  2. 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.
  3. Special Tools (affiliate links):9×13-inch Baking Dish or any 3–4-quart Oven-Safe Dish | Glass Mixing Bowls | Whisk
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. Vegetarian Option: You can leave out the meat and replace with another 1 cup of vegetables.
  9. 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.
  10. 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.
  11. 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.


  • 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
Easy Breakfast Casserole Recipe - Sally's Baking Addiction (2024)


Why is my breakfast casserole dry? ›

Probably 2 things: you're not using enough sauce, and you're baking it uncovered. Possibly the sauce you're using is too dry as well.

Do you have to refrigerate egg casserole overnight? ›

The casserole is covered and refrigerated overnight to allow the liquid ingredients to be absorbed into the bread. This is a perishable mixture and should be cooked the morning or day after assembly.

How do you keep breakfast casserole from falling? ›

For a puffy egg casserole, you can prevent falling by cooking at a lower temperature, as with this recipe.

How long can you keep uncooked egg casserole in the refrigerator? ›

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.

How do you moisten a dry breakfast casserole? ›

Covering the dish will trap the steam in and keep it moist while it heats. How do you moisten a dry casserole? Add a little water or milk to the top of the it before reheating.

Do you bake casseroles covered or uncovered? ›

Uncovering the foods promotes browning and crisping, and reduces the amount of liquid in the finished dish. If a casserole looks soupy when it's ready to bake, bake it uncovered unless the ingredients include pasta or rice, which absorb liquid.

Can you make a casserole with raw eggs ahead of time? ›

Yes, you can. Raw eggs are fairly stable in the freezer, especially when beaten or mixed with other ingredients. Check to see what else is in the casserole, though.

How many days will a breakfast casserole last in the fridge? ›

How long can you keep the baked egg casserole in the fridge? Egg bake casserole is typically safe to eat for up to 5 days, though the texture is best if eaten within a day or two. To keep it fresh, store it well-covered or in an airtight container.

What happens if you forget to put casserole in the fridge overnight? ›

Myth: You shouldn't put hot foods in the refrigerator.

Perishable foods should be put in a refrigerator that is 40 degrees or below within 2 hours of preparation. If you leave food out to cool and forget about it after 2 hours, throw it away.

Why is my breakfast casserole soupy? ›

This is often due to high water content in some vegetables and dense meats that are used in these dishes. Browning /cooking the meats (and draining off any excess liquid) and sautéing the vegetables before cooking often helps this issue.

How do you thicken breakfast casserole? ›

Make a cornstarch slurry for a fast and easy thickener.

Use one tablespoon of cornstarch per cup of liquid you would like to thicken. Stir out all the lumps. A few minutes before your casserole is done, add it a little at a time until you are happy with the thickness. Then, let the casserole finish baking.

How many days can you eat breakfast casserole? ›

After baking, leftover egg casserole can be stored in the fridge and enjoyed within 3-4 days. Leftovers are delicious reheated in the microwave.

Can you leave raw egg mix in the fridge? ›

If you've got raw egg yolks or whites left over from a recipe which you don't want to waste (let's face it, why would you?), you can store them in the fridge as long as you plan to use them within the next few days.

Is it better to freeze a breakfast casserole cooked or uncooked? ›

The answer depends on what's in it. Casseroles with raw protein (meat, poultry, seafood) should be completely cooked before freezing. However dishes with pre-cooked meats or no meat are fine to go in the freezer uncooked.

Can you eat cooked eggs left overnight? ›

Hard cooked eggs can be stored in the refrigerator up to seven days, either left in their shells or peeled. Make sure eggs are refrigerated within two hours after cooking, and don't leave refrigerated cooked eggs out at room temperature for more than two hours.

How do you get moisture out of a casserole? ›

Remove excess liquid

Yes, it really is that simple (at least some of the time). To remove the liquid without losing your meal, cover the casserole with a lid, leaving a small gap for drainage. Pour as much liquid out as you can, stirring the casserole occasionally to uncover any hidden puddles.

Why is my breakfast casserole so watery? ›

This is often due to high water content in some vegetables and dense meats that are used in these dishes. Browning /cooking the meats (and draining off any excess liquid) and sautéing the vegetables before cooking often helps this issue.

Why is my egg casserole rubbery? ›

Less desirable texture: Additionally, the high heat can also affect the texture of the eggs. The best slow cooker egg casseroles have a soft, creamy texture. When the high temperature setting is used, the eggs tends to lose their tenderness and become rubbery.

How do you make egg casserole not watery? ›

Baked egg dishes tend to have issues with becoming too rubbery or watery after cooking. This is especially the case when high-moisture vegetables or dense meats are in the mixture—sautéing the potatoes and vegetables before baking helps to dry the food and concentrate flavors.

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