This sausage breakfast casserole is one of those recipes that makes mornings feel a whole lot easier. Everything gets prepped the night before, so all that’s left to do is bake it in the morning and enjoy.

A square slice of sausage breakfast casserole being lifted from the pan with a metal spatula.

It’s hearty, simple, and made with ingredients people actually get excited about: savory sausage, fluffy eggs, melty cheese, and toasted bread. It’s a kid-friendly breakfast that works just as well for Christmas morning as it does for a lazy weekend at home.

I love this recipe when I need something filling that doesn’t require much effort first thing in the morning. It’s especially helpful for brunch, sleepovers, or anytime I’m feeding guests and want something easy but satisfying.

Two square slices of sausage and egg breakfast casserole stacked on a white plate, with the baking dish in the background.

When we want a savory breakfast, this sausage and egg casserole is always a favorite. And when we’re in the mood for something sweet, overnight French toast casserole or blueberry French toast casserole are just as easy to make ahead.

Why you’ll love this recipe

Make-ahead. Prep it the night before for an easy breakfast and stress-free morning.
Satisfying. This hearty casserole is packed with sausage, eggs, cheese, and bread to keep everyone full.
Customizable. Swap the cheese, use a different protein, or add your favorite veggies!
Great for guests. It’s a great recipe for holiday brunch, sleepovers, and busy mornings when you need to feed a crowd.

Ingredients for Sausage Breakfast Casserole with Egg

This section includes ingredient notes and substitution options. Get all measurements, ingredients, and instructions in the printable recipe card at the end of this post.

Overhead ingredient photo for sausage breakfast casserole showing eggs, thick white bread, ground breakfast sausage, shredded cheddar, half-and-half, salt, pepper, and mustard powder. Each ingredient is labeled with text on the image.

Ground breakfast pork sausage – Use your favorite breakfast sausage here. Jimmy Dean is a popular option.
Large eggs and half and half – This combination creates a rich, fluffy egg mixture that bakes up beautifully.
Cheddar cheese – Freshly grated cheese melts best, but pre-shredded cheese works well and keeps prep easy.
Thick white bread – Use sturdy, thick-cut bread like Texas toast for the best texture. Toast the bread first so it holds up well in the egg mixture.
Seasonings – Mustard powder, salt, and black pepper add simple flavor without overpowering the casserole.

How to Make Sausage Breakfast Casserole

This section shows you how to make the recipe with step-by-step photos and instructions. For the full printable recipe, see the recipe card below.

Collage pin with four numbered steps for making sausage breakfast casserole. Step 1 shows browned sausage in a cast-iron skillet, step 2 shows a bowl of whisked egg mixture, step 3 shows cubed bread, cooked sausage, and shredded cheddar in a glass bowl, and step 4 shows the assembled casserole in a white rectangular baking dish before baking.

Step 1: In a large skillet over medium-high heat, brown the sausage and crumble it with a spoon as it cooks. Drain the excess fat and set it aside.

Step 2: In a large bowl, whisk the eggs, half and half, dry mustard, salt, and pepper well to combine. Stir in the grated cheese, bread cubes, and cooked and drained sausage.

Step 3: Pour the sausage and egg mixture into a prepared 9×13 baking dish. Cover it tightly with plastic wrap and place it in the fridge to chill overnight.

Pro Tip:

Don’t skip toasting the bread! Since it soaks up the egg mixture overnight, using toasted cubes prevents it from getting too soggy.

Step 4: When you’re ready to bake it the next morning, preheat the oven to 350°F, remove the plastic wrap, and replace it with a piece of aluminum foil.

Step 5: Bake covered for 30 minutes, then remove the foil and continue baking for another 30 minutes until the center is set. Let it sit for 5 minutes before slicing and serving. Enjoy!

Top-down view of a baked sausage breakfast casserole in a white rectangular dish, cut into eight even squares. The top is golden with browned sausage and melted cheese, set on a light marble surface with kitchen items around it.

Storage

Refrigerator: Once the casserole has completely cooled, keep it stored in an airtight container for up to 3 days in the fridge. Any residual heat will trap moisture, causing the eggs to sweat and become soggy.

Freezer: Wrap leftover overnight breakfast casserole in plastic wrap and a layer of foil. You can also place it in a freezer bag. Keep it frozen for up to 2 months, and then thaw it in the fridge overnight and reheat it in the morning.

How to Reheat: Perfect for reheating in the microwave for a quick, hot breakfast. If you have a larger portion to reheat, you can pop it back in the oven, covered with foil, to warm through at 350°F.

Jaclyn’s Tips

Serve with sour cream, salsa, or hot sauce for an easy way to add extra flavor.
Baking it right away? Reduce the total bake time to about 45 minutes.
Day-old bread works well, as long as it’s thick and sturdy.
Brown the sausage well for best flavor.
Avoid overbaking so the eggs stay soft and fluffy.

Close-up of an overnight breakfast casserole serving being lifted from a white baking dish with a metal spatula. The casserole shows layers of bread, egg, sausage, and melted cheddar with a golden-brown top.

Additions and variations

Swap the bread. Sourdough bread, French bread, or even buttery brioche bread would be great.
Add veggies. Chopped spinach, mushrooms, green onion, bell peppers, hash browns, etc.
Use a different cheese. Swap the cheddar for Colby Jack, Pepper Jack, Monterey Jack, or Swiss Cheese.
Try a different sausage. Turkey sausage, chicken sausage, or Italian sausage.
Substitute half and half. Whole milk can be used instead.

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Close-up of a golden-brown sausage breakfast casserole with melted cheddar and crumbled sausage on top. A square piece is being lifted from the pan with a metal spatula, showing the layered interior.

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