Breakfast Sausage Casserole

Start your morning with this hearty, comforting Breakfast Sausage Casserole, a baked dish that brings together savory sausage, fluffy eggs, and melty cheese with golden bread cubes. Whether you are feeding a crowd for a special brunch or need a reliable make-ahead meal for busy mornings, this recipe delivers satisfying flavors and warmth in every bite.

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This American classic is easy to prepare, requiring just 20 minutes of active time before the oven does the rest. The day-old bread soaks up the seasoned egg and milk mixture, creating a texture that is both soft and substantial, while the sausage provides a savory protein punch that keeps you full.

Ingredients

• 1 pound (450 g) breakfast sausage, casings removed
• 1 small yellow onion, finely chopped (optional)
• 1/2 red bell pepper, diced (optional)
• 8 large eggs
• 2 cups (480 ml) whole milk
• 2 cups (200 g) shredded cheddar cheese, divided
• 1/2 cup (60 g) shredded mozzarella cheese
• 6 cups (about 250 g) day-old bread, cut into 1-inch cubes (e.g., French or sourdough)
• 1 teaspoon salt
• 1/2 teaspoon black pepper
• 1/2 teaspoon dried mustard powder
• 1/4 teaspoon paprika
• Butter or nonstick spray for greasing

Instructions

Step 1

Preheat the oven to 350°F (175°C). Grease a 9x13-inch (23x33 cm) baking dish with butter or nonstick spray.

Step 2

In a large skillet over medium heat, cook the sausage, breaking it up with a spoon, until browned and cooked through, about 5–7 minutes. If using, add onion and bell pepper; sauté until softened, 3–4 minutes. Drain excess fat.

Step 3

Spread the bread cubes evenly in the prepared baking dish. Top with the cooked sausage (and vegetables, if used).

Step 4

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

Step 5

Stir in 1 1/2 cups (150 g) of the cheddar cheese and all the mozzarella.

Step 6

Pour the egg mixture evenly over the bread and sausage in the baking dish. Gently press the bread down so it soaks up the liquid.

Step 7

Sprinkle the remaining cheddar cheese on top.

Step 8

Cover with foil and bake for 30 minutes. Remove foil and bake another 15 minutes until golden and set in the center.

Step 9

Let rest for 10 minutes before slicing and serving.

Preparation Tips

For an easy morning, utilize the make-ahead method. Assemble the casserole completely the night before, cover it tightly, and refrigerate. Bake as directed in the morning, adding 10 extra minutes to the cooking time if you are baking it straight from the fridge.

Variations and Substitutions

Customize the flavors by swapping cheddar for Swiss or pepper jack cheese for a different twist. You can also increase the vegetable content by adding chopped spinach or sautéed mushrooms along with the sausage.

Serving Suggestions

Serve this warm casserole with a side of fresh fruit or orange juice. For those who enjoy a bit of heat, offer salsa or hot sauce on the side for extra zing.

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Enjoy this satisfying breakfast that brings comfort to the table with minimal effort. With 23g of protein per serving, it is a nourishing way to start the day. Be mindful of allergens, as this dish contains eggs, milk, and wheat.

Recipe Questions & Answers

→ Can I prepare this casserole the night before?

Yes, assemble everything the night before, cover tightly, and refrigerate. Bake as directed in the morning, adding about 10 extra minutes since it will be cold from the fridge.

→ What type of bread works best?

Day-old French bread or sourdough works beautifully because it holds up well without becoming mushy. Stale bread absorbs the egg mixture while maintaining texture in the finished dish.

→ Can I use different cheese varieties?

Absolutely. Swiss cheese adds a nutty flavor, pepper jack brings some heat, or try Colby jack for a milder twist. The cheddar mozzarella combination creates excellent melt and flavor balance.

→ How do I know when the casserole is done?

The center should be set and not jiggly when you gently shake the pan. The top will be golden brown, and a knife inserted near the center should come out clean.

→ Can I add more vegetables?

Sautéed mushrooms, fresh spinach, or diced green peppers make excellent additions. Cook vegetables with the sausage to remove excess moisture before adding them to the dish.

→ How should I store leftovers?

Refrigerate in an airtight container for up to 4 days. Reheat individual portions in the microwave or cover the entire dish with foil and warm at 350°F until heated through.