Make Ahead Breakfast Casserole For A Crowd

Name: Make Ahead Breakfast Casserole For A Crowd
Prep time: 20 min
Cook time: 45 min
Total time: 1 h 5 min
Yield: 8 servings
Ingredients: 12 large eggs; 2 cups milk; 1 pound breakfast sausage or bacon, cooked and crumbled; 4 cups day-old bread, cubed; 2 cups shredded cheddar cheese; 1 cup diced bell peppers; 1 cup diced onions; 1 teaspoon salt; 1/2 teaspoon black pepper; 1 teaspoon garlic powder; 1 teaspoon dried oregano

Highlighted under: Express Kitchen

I love preparing a hearty breakfast casserole that can be made ahead of time. When hosting family or friends, this dish becomes my go-to because it offers a delicious, filling option that pleases everyone. The best part is that I can assemble it the night before and just pop it in the oven in the morning. With layers of eggs, cheese, bread, and savory vegetables, it’s a complete meal that bursts with flavor, making mornings stress-free and enjoyable.

Created by

Vanessa Doyle

Last updated on 2026-03-05T07:37:53.459Z

When I first tried making a breakfast casserole, I was amazed at how effortlessly it brought people together. The aroma of baked eggs and melted cheese wafting through the house creates an inviting atmosphere that’s hard to resist. I learned that letting the casserole sit overnight actually enhances its flavors, giving all the ingredients a chance to meld beautifully.

I also discovered that incorporating different vegetables and meats can completely transform the dish, allowing me to customize it according to my guests' preferences. Experimenting with herbs adds a lovely freshness, making this casserole a true crowd-pleaser.

Why You Will Love This Recipe
Prepare it in advance for hassle-free mornings
Versatile with countless ingredient options
Bursting with flavor, perfect for gatherings

Understanding the Ingredients

Each ingredient in this casserole plays a crucial role in achieving the perfect flavor and texture. The eggs and milk create a rich, custardy base that binds the other elements together, ensuring every bite is satisfying. I recommend using large, fresh eggs for the best volume and fluffiness. If you're looking to lighten the dish, consider using egg substitutes or a combination of eggs and egg whites without compromising the texture; just remember that your casserole may be slightly denser.

The choice of bread is equally important. Day-old bread is preferred because it absorbs the egg mixture without becoming overly soggy, leading to a layered texture with crispy edges when baked. For a twist, consider using sourdough or brioche, which will add distinctive flavors. Additionally, you may opt to include whole-grain or gluten-free bread for a healthier version that still holds up beautifully in the dish.

Make-Ahead and Storage Tips

This casserole is highly adaptable to make-ahead preparation. Assemble it the night before, cover tightly with foil, and refrigerate. This allows the flavors to meld, making the dish even more delicious. Just remember to extend the baking time by about 10-15 minutes if baking straight from the refrigerator in the morning, checking for doneness with a knife inserted in the center; it should come out clean.

Leftovers can be stored in an airtight container in the refrigerator for up to four days or in the freezer for up to three months. If you freeze it, slice into individual portions first for easy reheating. To reheat, simply place in the oven at 350°F (175°C) until warmed through, about 20-30 minutes, or use the microwave for quicker servings, ensuring they’re heated evenly to avoid cold spots.

Ingredients

Gather the following ingredients to create your breakfast casserole:

Casserole Ingredients

12 large eggs
2 cups milk
1 pound breakfast sausage or bacon, cooked and crumbled
4 cups day-old bread, cubed
2 cups shredded cheddar cheese
1 cup diced bell peppers
1 cup diced onions
1 teaspoon salt
1/2 teaspoon black pepper
1 teaspoon garlic powder
1 teaspoon dried oregano

Once you have your ingredients, you're ready to assemble your casserole!

Instructions

Follow these steps to prepare your breakfast casserole:

Preheat the Oven

Preheat your oven to 350°F (175°C). This ensures that your casserole will bake evenly.

Prepare the Mixture

In a large mixing bowl, whisk together the eggs and milk. Stir in the salt, pepper, garlic powder, and oregano.

Combine Ingredients

Add the crumbled sausage, cubed bread, cheese, bell peppers, and onions to the egg mixture. Mix until everything is evenly coated.

Transfer to Baking Dish

Grease a 9x13-inch baking dish and pour the mixture in. Spread it out evenly.

Bake

Cover the dish with foil and bake for 30 minutes. Then remove the foil and bake for an additional 15 minutes until the top is golden brown and set.

Cool and Serve

Let the casserole cool for a few minutes before slicing. Serve warm and enjoy!

Your breakfast casserole is now ready to delight your guests!

Pro Tips

For a vegetarian version, you can substitute the sausage with cooked spinach and mushrooms. Ensure to let your casserole set for at least 10 minutes before slicing to help it hold its shape.

Serving Suggestions

This breakfast casserole pairs wonderfully with a variety of sides. Consider serving it with a fresh fruit salad or a selection of pastries for a buffet-style breakfast that's both beautiful and satisfying. You can also offer various condiments, such as hot sauce or fresh herbs, allowing guests to customize their plates according to their tastes.

For a heartier meal, add crispy hash browns or roasted potatoes alongside. The contrast of soft casserole with crunchy potatoes creates an inviting texture combination. If you’re hosting a brunch, don't forget to provide beverages like fresh orange juice, coffee, or even mimosas to elevate the experience.

Vegetable Variations

One of the best aspects of this casserole is its versatility with vegetables. Feel free to experiment with seasonal veggies such as zucchini, spinach, or even kale. Just remember to sauté any high-water content vegetables before adding them to the mix; this prevents the casserole from becoming too watery and ensures a well-balanced flavor.

If you're looking for an extra kick, consider incorporating ingredients like jalapeños or spicy sausage for a zesty variation. You can also adjust the herbs used based on your preference—fresh thyme or basil can beautifully complement the flavors of this dish.

Questions About Recipes

→ Can I use different types of cheese?

Absolutely! Feel free to use your favorite cheeses like mozzarella, feta, or Monterey Jack for different flavors.

→ How far in advance can I prepare this casserole?

You can prepare it up to 24 hours in advance. Just cover it tightly and store it in the refrigerator before baking.

→ Can I freeze the casserole?

Yes, you can freeze it before baking. Just wrap it tightly and store it in the freezer. When ready to bake, thaw it in the fridge overnight and then cook as directed.

→ What are some good add-ins for this casserole?

You can add ingredients like spinach, mushrooms, cherry tomatoes, or even different types of meats to suit your taste.