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: 1 pound breakfast sausage; 12 large eggs; 2 cups milk; 1 teaspoon salt; 1/2 teaspoon black pepper; 1/2 teaspoon garlic powder; 1/2 teaspoon onion powder; 2 cups shredded Swiss cheese; 8 slices of bread (cubed); 1/4 cup chopped green onions (optional)

Highlighted under: Classic Comfort Recipes

I love hosting brunches, and this Make Ahead Breakfast Casserole is my go-to dish! It’s a delicious way to feed a crowd without the stress of cooking everything on the morning of. With layers of fluffy eggs, savory sausage, and Swiss cheese, it’s a hearty meal that everyone will enjoy. Plus, the best part is that I can assemble it a day in advance, giving me more time to spend with my guests. Trust me, this casserole will be the star of your next gathering!

Created by

Ella Townsend

Last updated on 2026-02-01T23:45:35.431Z

Making this Breakfast Casserole has become a wonderful tradition for our family gatherings. I remember the first time I served it; the looks on everyone’s faces when they took the first bite was priceless. The combination of fluffy eggs and savory sausage topped with gooey cheese is simply irresistible!

One of my favorite tips is to let the casserole sit in the fridge overnight. This allows the flavors to meld beautifully, resulting in a richer taste. Serve it with fresh fruit or pastries to round out the brunch!

Why You'll Love This Recipe
Easy to prepare ahead of time, saving you stress on the day of your brunch
Hearty and filling, making it perfect for larger gatherings
Can easily be customized with your favorite veggies or meats

Key Techniques for Perfecting Your Casserole

When making this breakfast casserole, the technique of layering is crucial. Start with a solid base, using cubed bread, which will soak up the egg mixture and add a delightful texture. Opt for a crusty bread like sourdough or French bread for added flavor and sturdiness. As you layer, ensure even distribution of the sausage and cheese to avoid heavy pockets of ingredients, which can lead to uneven cooking and texture.

Another important technique is allowing your casserole to chill before baking. A minimum of 30 minutes in the refrigerator allows the bread to absorb the egg mixture, which results in a softer, custardy texture. If possible, let it sit overnight. This extra time not only helps set the flavors but also ensures a more cohesive casserole that cooks evenly, avoiding any soggy or dry spots.

Ingredient Insights and Substitutions

The breakfast sausage is a key flavor component, but you can easily tailor it to your preferences. If you prefer a leaner option, turkey sausage works well and still provides great flavor. Additionally, for a meat-free version, consider swapping the sausage for sautéed vegetables like bell peppers, spinach, or mushrooms. These not only add nutrition but also maintain the casserole's hearty feel.

Swiss cheese provides a lovely melt and flavor, but feel free to experiment with other varieties. Cheddar or pepper jack can lend a sharper taste, while a mix of cheeses can add depth. Using a cheese blend or even dairy-free cheese options ensures that you can cater to guests with dietary restrictions while maintaining great taste.

Ingredients

For the Casserole

1 pound breakfast sausage
12 large eggs
2 cups milk
1 teaspoon salt
1/2 teaspoon black pepper
1/2 teaspoon garlic powder
1/2 teaspoon onion powder
2 cups shredded Swiss cheese
8 slices of bread (cubed)
1/4 cup chopped green onions (optional)

Instructions

Cook the Sausage

In a skillet over medium heat, cook the breakfast sausage until browned and fully cooked. Drain any excess grease and set aside.

Prepare the Egg Mixture

In a large bowl, whisk together the eggs, milk, salt, pepper, garlic powder, and onion powder until well combined.

Assemble the Casserole

In a greased 9x13 inch baking dish, layer the cubed bread, cooked sausage, and half of the Swiss cheese. Pour the egg mixture evenly over the top and sprinkle with the remaining cheese and green onions.

Chill and Bake

Cover the casserole and refrigerate for at least 30 minutes or overnight. Preheat your oven to 350°F (175°C) and bake for 45 minutes or until the casserole is set and golden brown on top.

Pro Tips

Feel free to add in your favorite vegetables like bell peppers or spinach for extra nutrition and flavor. You can also substitute the Swiss cheese for cheddar or a cheese blend.

Make-Ahead and Storage Tips

This breakfast casserole shines as a make-ahead dish! After assembling, you can refrigerate it for up to 24 hours before baking. This means you can prepare it the night before your brunch, allowing you to rise fresh in the morning. If you want to prepare further in advance, consider freezing the unbaked casserole. Just wrap it tightly in plastic wrap, then aluminum foil, and it can stay in the freezer for up to three months. When you’re ready to bake, thaw overnight in the refrigerator before cooking.

To reheat leftovers, slice them up and place them in a baking dish. Cover with foil to prevent drying out and warm them in a 350°F (175°C) oven for about 25-30 minutes, or until heated through. You can also microwave individual portions, but be cautious to not overcook, which can lead to a rubbery texture.

Serving Suggestions

When serving this breakfast casserole, consider pairing it with fresh fruits or a mixed greens salad for a colorful contrast. A simple fruit salad of berries, melons, and citrus can brighten the plate and add a refreshing component. If you want to elevate the flavors served alongside, a dollop of sour cream or a drizzle of hollandaise sauce brings richness that complements the hearty casserole.

For an extra-special touch, mix a signature cocktail like mimosas or a fruit-infused iced tea to accompany your brunch. These light and bubbly drinks enhance the casual elegance of your gathering, making the whole experience more festive. Providing a variety of toppings, like hot sauce or fresh herbs, also allows guests to customize their servings, adding a personal touch.

Questions About Recipes

→ Can I make this casserole without meat?

Absolutely! You can omit the sausage and add in your choice of vegetables instead.

→ How do I store leftovers?

Leftovers can be stored in an airtight container in the fridge for up to 3 days. Reheat in the microwave or oven.

→ Can I freeze the casserole?

Yes, you can freeze the assembled casserole before baking. Just wrap it well and it will keep for up to 2 months.

→ What kind of bread works best?

I prefer using a sturdy bread like sourdough or whole wheat, but any bread you have on hand will work.