Name: Sausage and Egg Casserole
Prep time: 15 min
Cook time: 50 min
Total time: 65 min
Ingredients: 1 lb breakfast sausage, bulk or casings removed; 8 large eggs; 2 cups whole milk; 6 slices white or sandwich bread, cubed (day-old preferred); 2 cups shredded cheddar cheese, divided; 1/2 tsp garlic powder; 1/2 tsp onion powder; 1/2 tsp dry mustard powder; salt and black pepper to taste; 1 tbsp butter (for greasing dish); fresh chives or parsley for garnish (optional)

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Mornings go a lot smoother when breakfast is already done. This Sausage and Egg Casserole is built to be assembled the night before and baked fresh in the morning, which means you get a hot, hearty breakfast without doing anything before your first cup of coffee. Savory sausage, fluffy egg custard, melted cheddar, and soft bread baked together in one dish. It slices cleanly, reheats well, and works just as well for a slow weekend as it does for a weekday with a packed schedule.

The overnight rest is actually what makes the texture right. The bread absorbs the egg mixture fully, so every bite is custardy and cohesive rather than soggy in some places and dry in others.

Ingredients for This Sausage and Egg Casserole

Standard breakfast ingredients pulled into one baking dish. No specialty items needed.

1 lb breakfast sausage, bulk or casings removed
8 large eggs
2 cups whole milk
6 slices white or sandwich bread, cubed
2 cups shredded cheddar cheese, divided
1/2 tsp garlic powder
1/2 tsp onion powder
1/2 tsp dry mustard powder
Salt and black pepper to taste
1 tbsp butter for greasing the dish
Fresh chives or parsley for garnish (optional)

How to Build and Bake This Sausage and Egg Casserole

Assembly takes about 15 minutes. After that the dish does all the work either overnight in the fridge or directly in the oven.

Cook sausage in a skillet over medium heat, breaking it apart as it browns. Drain excess fat and set aside to cool slightly.
Grease a 9×13 baking dish with butter. Spread the cubed bread evenly across the bottom.
Scatter the cooked sausage over the bread layer. Sprinkle 1.5 cups of cheddar cheese on top.
In a large bowl, whisk together eggs, milk, garlic powder, onion powder, dry mustard, salt, and pepper until fully combined.
Pour the egg mixture evenly over the bread, sausage, and cheese. Press down gently with a spatula to make sure all the bread is submerged and soaking up the custard.
Sprinkle the remaining half cup of cheddar over the top. Cover tightly with plastic wrap and refrigerate for at least 1 hour, or overnight for best results.
When ready to bake, remove from the fridge and let sit at room temperature for 20 minutes. Preheat oven to 350°F.
Bake uncovered for 45 to 55 minutes until the center is set, the top is golden, and a knife inserted in the middle comes out clean.
Rest for 5 to 10 minutes before slicing and serving.

Texture Problems and How to Avoid Them

A watery casserole almost always means the egg mixture was poured over warm sausage that hadn’t fully cooled, or the casserole went straight from the fridge to the oven without a rest. Both situations affect how evenly the custard sets. Let the sausage cool before layering, and always give the dish 15 to 20 minutes to take the chill off before baking.

If the top browns too quickly before the center sets, tent it loosely with foil after the first 30 minutes and continue baking. This is more common in darker baking dishes that absorb more heat than lighter ceramic ones.

Substitutions Worth Knowing

Spicy Italian sausage or chicken sausage both work as swaps for standard breakfast sausage. Chicken sausage is leaner and gives a lighter result overall. For a skillet breakfast recipes shortcut, use pre-cooked sausage crumbles and skip the browning step entirely. The flavor won’t be as developed but the texture holds fine in the casserole.

Any sturdy bread works here. Sourdough adds a mild tang, brioche makes the custard richer, and whole wheat adds a slightly nutty note. Avoid very soft sandwich bread if you want cleaner slices since it tends to break down more completely during the long soak. Day-old bread actually absorbs the egg mixture better than fresh.

Variations to Change It Up

Add diced bell peppers, mushrooms, or spinach to the sausage layer for a more loaded breakfast egg dish. Saute the vegetables briefly before adding them so they don’t release excess moisture into the casserole during baking. A pinch of red pepper flakes in the egg mixture adds background heat that works well with sausage and eggs without being overpowering.

Swap cheddar for pepper jack for a spicier profile, or use a mix of gruyere and parmesan for something that feels a little more elevated. The base recipe is flexible enough to take most cheese combinations without changing the structure of the bake.

Storing and Reheating

Cover leftovers tightly and refrigerate for up to 4 days. Individual slices reheat well in the microwave for 60 to 90 seconds, or in a 325°F oven for 10 to 12 minutes if you want to bring back some of the crispy edges. The casserole also freezes well. Slice into individual portions, wrap each one tightly, and freeze for up to 2 months. Thaw overnight in the fridge before reheating.

This makes it one of the more practical make ahead egg dishes for breakfast when you want several days of easy mornings from a single cooking session.

FAQ

Can I bake this casserole without refrigerating overnight?

Yes. A minimum soak of 30 minutes to 1 hour gives the bread enough time to absorb the egg mixture. The texture won’t be quite as custardy and cohesive as the overnight version, but it still bakes up well. If you’re short on time, press the bread down firmly after pouring the egg mixture and let it sit at room temperature for 30 minutes before baking.

How do I know when the casserole is fully cooked?

Insert a thin knife or toothpick into the center of the casserole. It should come out clean with no wet egg clinging to it. The center should feel firm when you press it lightly, not jiggly. If it still moves noticeably in the middle, give it another 5 to 8 minutes and check again.

Can I use egg whites only?

You can substitute with egg whites, using about 14 to 16 egg whites in place of 8 whole eggs. The texture will be less rich and slightly less golden on top, but the casserole still sets properly. Add an extra pinch of salt since egg whites have a blander flavor than whole eggs.

Can I make this without bread?

Yes. Skip the bread entirely for a lower-carb version that’s closer to a frittata or baked egg dish. The casserole will be denser and sliceable but won’t have the custardy, bread-pudding quality of the original. Hash browns or frozen diced potatoes make a good low-carb alternative base that still absorbs the egg mixture well.

What size baking dish works best?

A standard 9×13 inch baking dish is ideal for this recipe. A smaller dish like an 8×8 can work if you halve the recipe, but the casserole will be thicker and may need an extra 10 minutes of bake time. Check the center carefully before pulling it from the oven since thicker casseroles are more prone to an underdone middle.