Christmas morning should be filled with cozy pajamas, coffee refills, and time with family—not scrambling over the stove. This make-ahead Christmas morning breakfast casserole is the perfect solution. It’s hearty, comforting, and designed to be prepped the night before so all you have to do is bake and enjoy.

Loaded with eggs, cheese, savory sausage, and soft bread, this casserole is a holiday classic that feeds a crowd and pairs beautifully with fresh fruit and hot coffee. Whether you’re hosting extended family or keeping things simple, this recipe delivers big flavor with minimal effort.

Why You’ll Love This Christmas Breakfast Casserole

Make-ahead friendly: Assemble the night before and bake in the morning
Feeds a crowd: Perfect for Christmas morning guests
Customizable: Swap meats, cheeses, or veggies
Comfort food classic: Warm, savory, and satisfying
Minimal cleanup: One dish, no stress

This dish has become a holiday tradition in many households because it lets you focus on what matters most—being present on Christmas morning.

Ingredients for Christmas Morning Breakfast Casserole

This recipe serves 8–10 people.

Base Ingredients

1 loaf day-old French bread or sourdough, cut into 1-inch cubes
1 pound breakfast sausage (pork, turkey, or chicken)
8 large eggs
2 ½ cups whole milk (or half-and-half for richer flavor)
2 cups shredded sharp cheddar cheese
1 cup shredded mozzarella or Monterey Jack cheese
1 medium onion, finely diced
1 teaspoon salt
½ teaspoon black pepper
1 teaspoon garlic powder
1 teaspoon dry mustard (optional but recommended)

Optional Add-Ins

1 cup sautéed mushrooms
1 cup diced bell peppers
2 cups fresh spinach, wilted
Cooked bacon or diced ham
A pinch of nutmeg for warmth

How to Make a Make-Ahead Christmas Breakfast Casserole

Step 1: Prepare the Sausage

In a large skillet over medium heat, cook the breakfast sausage until browned and fully cooked. Break it into small crumbles as it cooks. Add the diced onion and sauté until softened, about 3–4 minutes. Drain excess grease and set aside.

Step 2: Assemble the Casserole

Grease a 9×13-inch baking dish. Spread the cubed bread evenly across the bottom. Sprinkle the cooked sausage and onion mixture over the bread. Add any optional vegetables at this stage.

Top evenly with the shredded cheeses.

Step 3: Mix the Egg Custard

In a large bowl, whisk together the eggs, milk, salt, pepper, garlic powder, and dry mustard. Whisk until fully combined.

Slowly pour the egg mixture over the casserole, making sure all bread pieces are moistened. Press down gently with a spatula if needed.

Step 4: Refrigerate Overnight

Cover tightly with foil or plastic wrap and refrigerate for at least 8 hours or overnight. This allows the bread to soak up the custard, creating a soft, fluffy interior when baked.

Baking Instructions (Christmas Morning!)

Remove the casserole from the refrigerator 30 minutes before baking.
Preheat oven to 350°F (175°C).
Bake covered with foil for 30 minutes.
Remove foil and bake an additional 20–25 minutes, until golden on top and set in the center.
Let rest for 10 minutes before slicing and serving.

Tips for the Best Breakfast Casserole

Use day-old bread: Slightly stale bread absorbs the egg mixture better.
Don’t skip the rest time: Letting it sit overnight improves texture and flavor.
Cover first, uncover later: Prevents over-browning while ensuring a golden finish.
Test for doneness: A knife inserted in the center should come out clean.

Make It Your Own: Variations

Vegetarian Christmas Breakfast Casserole

Skip the sausage and add mushrooms, spinach, bell peppers, and extra cheese.

Sweet & Savory Version

Use maple breakfast sausage and add a drizzle of maple syrup just before serving.

Southwest Style

Add green chiles, pepper jack cheese, and serve with salsa and avocado.

Lighter Option

Use turkey sausage, low-fat milk, and reduced-fat cheese without sacrificing flavor.

What to Serve with Christmas Morning Breakfast Casserole

Fresh fruit salad or citrus slices
Cinnamon rolls or muffins
Hot coffee, tea, or hot chocolate
A light green salad for balance

This casserole pairs beautifully with both sweet and savory sides, making it ideal for a holiday spread.

Storage and Reheating

Refrigeration

Store leftovers in an airtight container in the refrigerator for up to 4 days.

Freezing

This casserole freezes well. Wrap tightly and freeze for up to 2 months. Thaw overnight before reheating.

Reheating

Reheat individual portions in the microwave or warm the entire dish in a 325°F oven until heated through.

Frequently Asked Questions

Can I make this breakfast casserole two days ahead?

Yes! Assemble up to 48 hours in advance and keep refrigerated until baking.

Can I use gluten-free bread?

Absolutely. Just ensure it’s sturdy enough to hold the custard.

How do I know when it’s fully cooked?

The center should be firm, not jiggly, and reach an internal temperature of 160°F.

The Perfect Christmas Morning Tradition

This make-ahead Christmas morning breakfast casserole is more than just a recipe—it’s a stress-free holiday tradition waiting to happen. By doing the prep ahead of time, you give yourself the gift of a relaxed, joyful morning with the people you love.

Whether it’s your first time making a holiday breakfast casserole or a long-standing family favorite, this dish is guaranteed to bring warmth, comfort, and full plates to your Christmas table.