Dinner

Grilled Cheese Sausage & Egg Breakfast Casserole Recipe

ByMariam Harutyunyan September 9, 2026September 9, 2026

Introduction

This Grilled Cheese Sausage & Egg Breakfast Casserole is a hearty and comforting way to start your day. Combining crispy grilled cheese sandwiches with savory breakfast sausage and a rich egg custard, it’s perfect for feeding a crowd or meal prepping. Easy to assemble and full of flavor, it’s a breakfast everyone will love.

A close-up of a stacked sandwich showing two thick slices of golden-brown toasted bread with a crispy, textured crust. Between the bread layers, there is a thick, melted bright orange cheddar cheese that oozes out, surrounding small, browned sausage pieces scattered across the sandwich. There are also visible sections of white cooked egg with a soft texture underneath the cheese. The sandwich sits on a white plate with a light sprinkling of red and green seasoning around it, set against a white marbled surface. Photo taken with an iphone --ar 4:5 --v 7

Ingredients

1 lb (450 g) breakfast sausage
8 large eggs

2 cups whole milk
½ cup heavy cream

8 slices sandwich bread
3 tablespoons butter, softened

2 cups shredded cheddar cheese
1 cup shredded mozzarella cheese
½ teaspoon garlic powder

½ teaspoon onion powder
½ teaspoon smoked paprika
½ teaspoon salt

¼ teaspoon freshly ground black pepper
2 tablespoons chopped fresh parsley or green onions

Optional Add-Ins:

½ cup diced bell peppers
½ cup diced onion
½ cup cooked and crumbled bacon

¼ teaspoon red pepper flakes
½ cup sliced mushrooms
1 small jalapeño, finely chopped

Instructions

Step 1: Preheat your oven to 350°F (175°C) and lightly grease a 9 × 13-inch baking dish with butter or nonstick cooking spray. Set aside.
Step 2: In a large skillet over medium heat, cook the breakfast sausage for 7–9 minutes, breaking it into small pieces. Cook until browned and fully cooked. If using, add onions, peppers, or mushrooms during the last few minutes to sauté. Drain excess grease and set aside.
Step 3: Spread softened butter on bread slices. Heat a skillet over medium heat, place bread butter-side down, sprinkle with cheddar and mozzarella, then top with another buttered slice. Cook 2–3 minutes per side until golden and cheese begins to melt. Let cool and cut into 1-inch cubes.

Step 4: In the baking dish, layer half of the grilled cheese cubes, half the cooked sausage, and a light layer of shredded cheddar. Repeat layers and finish with a generous handful of cheese, distributing evenly.
Step 5: In a large bowl, whisk eggs, milk, heavy cream, garlic powder, onion powder, smoked paprika, salt, and pepper until combined. Pour evenly over the casserole, pressing the bread gently into the liquid. Let rest 10–15 minutes to absorb.
Step 6: Sprinkle remaining cheddar and mozzarella over the top. Add an extra ½ cup cheddar for more cheesiness if desired.

Step 7: Cover the dish loosely with foil and bake for 25–30 minutes. Remove foil and bake an additional 15–20 minutes until the center is set and the top is golden. Check doneness by inserting a knife—it should come out clean.
Step 8: Let the casserole rest for 10 minutes before slicing. Garnish with chopped parsley or green onions and serve warm.

Tips & Variations

For extra flavor, sauté optional vegetables like bell peppers or mushrooms with the sausage to remove moisture and enhance taste.

Try adding cooked bacon or jalapeño for a smoky or spicy kick.
Use your favorite bread, such as sourdough or whole wheat, to change the texture and flavor.
Make it vegetarian by omitting sausage and adding more vegetables or plant-based sausage alternatives.

Leftover casserole can be reheated in the oven or microwave for a quick breakfast.

Storage

Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat individual servings in the microwave or warm the entire casserole covered with foil in a 350°F (175°C) oven until heated through. For longer storage, freeze portions wrapped tightly for up to 1 month; thaw overnight in the fridge before reheating.

How to Serve

A close-up of a grilled cheese sandwich with two thick slices of golden-brown toasted bread, stuffed with bright orange melted cheddar cheese dripping out and slices of cooked sausage pieces scattered on the cheese. Between the bread layers, there is a visible layer of white melted egg, slightly creamy and soft. The sandwich rests on a white plate with a sprinkle of red seasoning and green herbs around it, and the whole scene is set against a white marbled background. Photo taken with an iphone --ar 4:5 --v 7

Serve this delicious recipe with your favorite sides.

FAQs

Can I prepare this casserole the night before?

Yes, assemble the casserole and refrigerate it covered overnight. Let it sit at room temperature for 10–15 minutes before baking the next morning.

Can I use other types of cheese?

Absolutely! Cheddar and mozzarella provide great flavor and melt, but try mixing in pepper jack, Monterey jack, or Swiss for different tastes and textures.