Easy Breakfast Casserole Recipe for 9x9 Pan

Starting your day with a warm, hearty breakfast can set a positive tone for the hours ahead. This breakfast casserole recipe is perfect for preparing ahead, feeding a crowd, or enjoying a comforting meal on busy mornings. Its simple ingredients and straightforward steps make it a go-to for weekend brunches, holiday mornings, or anytime you crave a satisfying breakfast baked in one dish.

Ingredients

6 large eggs
1 cup whole milk (or 2%)
1 teaspoon salt
1/2 teaspoon black pepper
1/2 teaspoon garlic powder (optional)
2 cups cooked breakfast sausage, crumbled or sliced
2 cups shredded cheddar cheese
3 cups day-old bread, cubed (white, whole wheat, or a mix)
1 small onion, diced (optional)
1/2 cup chopped bell peppers (optional)
Fresh herbs for garnish (parsley, chives, optional)

Instructions

Preheat your oven to 350°F (175°C). Grease a 9×9-inch baking dish with butter or non-stick spray to prevent sticking.

In a large mixing bowl, whisk together the eggs, milk, salt, pepper, and garlic powder until well combined.
In a separate bowl, combine the cooked sausage, bread cubes, diced onion, and bell peppers if using. Mix thoroughly.
Spread the bread and sausage mixture evenly in the prepared baking dish.

Pour the egg mixture over the bread and sausage, ensuring all pieces are coated and the mixture is evenly distributed.
Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes.

Remove the foil and continue baking for an additional 10-15 minutes, or until the casserole is puffed, golden, and the cheese is bubbly.
Allow the casserole to rest for 5 minutes before slicing. Garnish with chopped fresh herbs if desired.
Serve warm, and enjoy a hearty breakfast that can be prepared ahead of time and baked fresh in minutes.

Tips

For a vegetarian version, substitute cooked vegetables like spinach, mushrooms, or zucchini for the sausage.
Use day-old bread for best absorption; stale bread helps soak up the egg mixture without becoming too soggy.
To prepare in advance, assemble the casserole, cover, and refrigerate overnight. Bake directly from the fridge, adding an extra 10 minutes to the baking time.

For a lower-fat option, use egg whites or a combination of eggs and egg whites, and reduce the cheese or opt for a reduced-fat variety.

Serving Suggestions

Serve this casserole with a side of fresh fruit, a green salad, or crispy breakfast potatoes for a complete meal. It pairs well with hot sauce or salsa for added flavor. For a brunch spread, include muffins, yogurt, and coffee for a well-rounded experience.

Variations

Vegetable Breakfast Casserole: Add cooked spinach, mushrooms, zucchini, or kale for extra nutrients and flavor.

Mexican-Style: Incorporate diced tomatoes, chopped cilantro, and a sprinkle of cumin. Top with sliced avocado before serving.
Ham and Cheese: Swap the sausage for cooked ham slices or cubes for a different flavor profile.
Sweet Breakfast Casserole: Use croissants or brioche bread, add cinnamon, and top with berries or sliced bananas for a sweet twist.

Storage and Reheating

Allow the casserole to cool completely before storing. Cover tightly with plastic wrap or foil and refrigerate for up to 3 days. To reheat, microwave individual portions for 1-2 minutes or reheat the entire casserole in an oven at 350°F (175°C) for about 20 minutes until warmed through. For best results, reheat portions in short bursts to prevent drying out.

Frequently Asked Questions

Can I prepare this casserole the night before?

Absolutely. Assemble the casserole, cover it tightly, and refrigerate overnight. In the morning, bake as directed, adding an extra 10 minutes to the baking time if it’s coming straight from the fridge.

Can I freeze leftovers?

Yes, leftovers freeze well. Let the casserole cool completely, then cut into portions and store in airtight containers or freezer bags. Freeze for up to 2 months. To reheat, thaw overnight in the fridge and microwave or bake at 350°F until heated through.

What if I don’t have bread?

If you don’t have bread, you can substitute cooked hash browns or cooked breakfast potatoes for a similar texture and to soak up the egg mixture. Just ensure they are cooked and cooled before adding to the casserole.

How can I make this dish gluten-free?

Use gluten-free bread or substitute with cooked quinoa or rice for the bread cubes. Ensure all other ingredients, such as sausage and cheese, are gluten-free or check labels accordingly.

Can I add cheese on top after baking instead of mixing it in?

Yes, sprinkling cheese on top during the last 10 minutes of baking or immediately after removing from the oven creates a melty, crispy cheese crust that many find delicious.

How long does it take to bake from start to finish?

The total baking time is approximately 40-45 minutes, including preheating, assembly, and baking. Preparing the ingredients takes about 15 minutes, making it a quick and satisfying breakfast option.

Easy Breakfast Casserole Recipe for 9×9 Pan