Can I make Christmas Morning Breakfast Casserole the night before?

Yes, assemble the casserole up to 24 hours ahead and cover it tightly in the refrigerator. Bake it at 375°F and add about 5 extra minutes because the chilled ingredients need more time to warm through.

How long does this breakfast casserole last in the refrigerator?

Store leftovers in a sealed container for up to 4 days in the refrigerator. Reheat individual portions at 350°F for 12 to 15 minutes until the center reaches a warm temperature.

Can I freeze this Christmas Morning Breakfast Casserole?

Freeze baked portions for up to 2 months by wrapping them tightly in freezer-safe layers. Thaw overnight in the refrigerator, then reheat at 350°F for 20 minutes for the best texture.

Why is my casserole watery after baking?

Extra moisture usually comes from frozen hashbrowns that were not thawed and drained. Let the potatoes release excess water before mixing and bake until the center reaches 160°F.

Can I double this recipe for a larger crowd?

Yes, prepare two separate 9x13 baking dishes instead of making one deeper casserole. Baking two pans keeps the egg custard even and avoids a raw center.

What can I serve with this casserole for brunch?

Serve slices with fresh fruit, coffee or a lighter side like our Raspberry Breakfast Bars . The savory filling pairs well with sweet breakfast dishes.

Christmas Morning Breakfast Casserole Breakfast Casserole Recipe

Name: Christmas Morning Breakfast Casserole
Prep time: 15 min
Cook time: 40 min
Total time: 55 min
Cuisine: American
Ingredients: 1 pound breakfast sausage (Browned and crumbled to add savory flavor and a rich base layer.); 3 cups frozen hashbrowns (Thawed before mixing so extra moisture doesn’t water down the casserole.); 8 large large eggs (Whisked into a custard that binds the casserole layers.); 2 cups whole milk (Creates a soft egg texture and helps the custard bake evenly.); 1 teaspoon salt (Seasoning that balances the egg and sausage flavors.); 1/2 teaspoon black pepper (Adds mild warmth throughout the filling.); 2 cups sharp cheddar (Shredded and melted on top for a golden cheesy finish.); 2 tablespoons green onion (Chopped and added after baking for a fresh contrast.)

Description

This Christmas Morning Breakfast Casserole is an easy breakfast casserole idea with simple layers of eggs, sausage and potatoes. It works for holiday brunch, party mornings and meal prep because the method is quick and simple. The best part is the golden top, soft center and rich flavor from the baked layers. This healthy breakfast casserole uses balanced ingredients and a clever make ahead trick. The recipe brings comfort without extra fuss.

Ingredients

Scale

1 pound breakfast sausage (Browned and crumbled to add savory flavor and a rich base layer.)
3 cups frozen hashbrowns (Thawed before mixing so extra moisture doesn’t water down the casserole.)
8 large large eggs (Whisked into a custard that binds the casserole layers.)
2 cups whole milk (Creates a soft egg texture and helps the custard bake evenly.)
1 teaspoon salt (Seasoning that balances the egg and sausage flavors.)
1/2 teaspoon black pepper (Adds mild warmth throughout the filling.)
2 cups sharp cheddar (Shredded and melted on top for a golden cheesy finish.)
2 tablespoons green onion (Chopped and added after baking for a fresh contrast.)

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Instructions

Cook 1 pound breakfast sausage in a skillet over medium-high heat for 8 to 10 minutes until fully browned. Break it into small pieces with a spatula and fold in thawed frozen hashbrowns during the final 2 minutes to coat them lightly. (I tried rushing this step once and the casserole had greasy spots. The extra browning time fixed it.) You’ll see deep brown sausage bits and pale golden hashbrowns with a savory smell. Listen for the gentle sizzle to slow before moving on. Miss this window and excess fat can make the center heavy. Brown the sausage fully because the flavor develops before baking.
Whisk 8 large eggs with 2 cups whole milk, 1 teaspoon salt and 1/2 teaspoon black pepper for 2 minutes until blended. Add the sausage and hashbrowns, then fold gently with a rubber spatula in a J-shaped motion for 60 seconds so every piece gets coated. Transfer the mixture into the baking dish and spread it unevenly. The mixture should look creamy and speckled. You’ll smell the sausage and spices as they blend. Skip the full coating step and dry egg pockets may form. Mixing well keeps the egg custard even during baking.
Bake the filled 9×13 ceramic baking dish at 375°F for 35 to 40 minutes until the center reaches 160°F. Spread 2 cups shredded sharp cheddar across the top during the last 10 minutes and bake until melted. Rotate the dish halfway through if your oven heats unevenly. The cheese should melt into golden patches and the edges should lightly brown. You’ll notice a rich baked egg smell. Go past 40 minutes and the eggs can become rubbery. Bake at 375°F because steady heat sets the custard without drying it.
Rest the baked casserole for 10 minutes after removing it from the 375°F oven, then cut one portion with a clean motion. Place the slice on a plate while keeping the layers intact and add 2 tablespoons chopped green onion for a fresh finish. The slice should hold its shape with melted cheese and soft egg layers. You’ll see browned edges and a tender center. Skip the rest and the filling may slide apart. Resting 10 minutes lets the custard firm for cleaner portions.

Notes

Pro Tips:

Brown the breakfast sausage for 8 to 10 minutes until it has deep brown edges because raw sausage can release extra grease into the egg mixture.
Choose frozen hashbrowns without added seasoning and thaw them overnight so 3 cups blend evenly without extra moisture.
Use a 9×13 baking dish because the casserole layer should stay about 2 inches thick. A smaller dish can leave the center soft while edges overcook.
Assemble the casserole up to 24 hours ahead and keep it chilled until baking. Add 5 extra minutes if it goes into the oven cold.
Don’t cover the cheese layer too early during baking at 375°F because trapped moisture can stop the top from forming golden patches.
Rest the casserole for exactly 10 minutes after baking so slices stay together and the egg layers don’t slide apart.
Add chopped green onion after baking with a 2 tablespoon sprinkle for fresh flavor without making the surface watery.

Storage: Keep leftover Christmas Morning Breakfast Casserole in an airtight container in the refrigerator for up to 4 days. You can freeze baked portions for up to 2 months when wrapped tightly in foil and a freezer bag. Reheat slices at 350°F for 12 to 15 minutes and add a small sprinkle of fresh cheddar if desired. Discard leftovers if you notice sour smells, slimy texture or unusual color changes.

Prep Time: 15 minutes
Cook Time: 40 minutes
Category: Breakfast
Cuisine: American

Nutrition

Serving Size: 1 serving