Easy Breakfast Casserole Recipe for 8x8 Pan

Start your day with this delicious and hearty breakfast casserole, perfect for feeding a family or preparing ahead for weekend brunch. Its combination of eggs, cheese, and savory ingredients makes it a versatile dish that can be customized to your taste and easily baked in a standard 8×8-inch pan.

Ingredients

8 large eggs
1 cup whole milk (or 2%)
1 teaspoon salt
½ teaspoon black pepper
1 cup shredded cheddar cheese
1 cup cooked breakfast sausage, crumbled (or cooked bacon, chopped)
1 cup diced cooked potatoes (optional, for added heartiness)
½ cup diced bell peppers (any color)
½ cup chopped green onions
2 cups day-old bread, cubed (e.g., French bread, bread rolls)

Instructions

Preheat your oven to 375°F (190°C). Grease an 8×8-inch baking dish with butter or non-stick spray.
In a large mixing bowl, whisk together the eggs, milk, salt, and black pepper until well combined.
Add the shredded cheddar cheese, cooked sausage, diced potatoes (if using), bell peppers, and green onions to the egg mixture. Stir gently to distribute evenly.

Layer the cubed bread evenly in the prepared baking dish. Pour the egg mixture over the bread, pressing down slightly to ensure the bread absorbs the liquid.
Cover the dish with plastic wrap or foil and refrigerate for at least 30 minutes, or overnight. This step allows the bread to soak up the custard and enhances flavor.
Remove the casserole from the fridge and let it sit at room temperature for about 10 minutes. Then, bake uncovered in the preheated oven for 35-40 minutes, or until the top is golden brown and a toothpick inserted in the center comes out clean.

Allow the casserole to rest for 5 minutes before slicing and serving. Garnish with additional green onions or hot sauce if desired.

Tips

Substitutions: Use cooked ham, turkey sausage, or vegetarian sausage for different flavors. For cheese, cheddar can be replaced with Monterey Jack, Swiss, or a blend.
Storage: Cover and refrigerate leftovers for up to 3 days. To freeze, wrap tightly and store for up to 1 month. Thaw overnight in the fridge before reheating.

Common mistakes: Not letting the casserole soak long enough can result in a dry texture. Be sure to refrigerate for at least 30 minutes or overnight for best results.
Adjust the baking time if your casserole is thicker or thinner; start checking around 35 minutes to prevent overbaking.

Serving Suggestions

Serve this breakfast casserole with fresh fruit, such as sliced melon or berries, and a side of toast or warm muffins. A dollop of sour cream or hot sauce can add extra flavor. It pairs well with a glass of orange juice or coffee for a complete morning meal.

Variations

Vegetarian Version: Omit the sausage and add sautéed mushrooms, spinach, or zucchini for added vegetables.
Mexican-Inspired: Incorporate diced tomatoes, jalapeños, and pepper jack cheese. Top with fresh cilantro before serving.
Low-Carb: Skip the bread and increase the eggs and cheese, adding extra vegetables for texture.

Meat Lover’s: Use a combination of bacon, sausage, and ham for a hearty version.

Storage and Reheating

Leftover breakfast casserole can be stored covered in the refrigerator for up to 3 days. To reheat, microwave individual portions on high for 1-2 minutes or until hot. For larger portions, reheat in a 350°F (175°C) oven for about 15-20 minutes. If freezing, thaw overnight in the fridge and reheat as described. The casserole maintains good texture for up to 1 month in the freezer.

Frequently Asked Questions

Can I prepare this casserole the night before?

Yes, assembling the casserole the night before and refrigerating it overnight allows the flavors to meld and makes morning prep quicker. Just bake it as directed in the morning.

Can I use different types of bread?

Absolutely. Day-old baguette, croissants, or even leftover dinner rolls work well. The key is using bread that can soak up the custard without falling apart.

How do I know when the casserole is done?

It’s ready when the top is golden brown and a toothpick inserted into the center comes out clean. The internal temperature should reach 160°F (71°C) for safety.

What if I don’t have green onions?

You can substitute chopped chives, parsley, or omit the green garnish altogether. These add a fresh flavor but are not essential to the dish’s structure.

Can I make this gluten-free?

Yes. Use gluten-free bread and ensure any added ingredients, like sausage or seasoning, are gluten-free. This way, everyone can enjoy it without concern.

Is this dish suitable for freezing?

Yes, it freezes well. Just wrap tightly in plastic wrap and foil, then store in the freezer for up to a month. Thaw overnight in the fridge before reheating.

Easy Breakfast Casserole Recipe for 8×8 Pan