Why You’ll Love This Christmas Breakfast Casserole

This Christmas Breakfast Casserole is a warm, hearty, and flavorful dish that brings the whole family together. With savory sausage, fluffy eggs, gooey melted cheese, and perfectly toasted bread, it’s a holiday tradition you’ll want to revisit year after year. The best part? You prepare it the night before, so all you have to do is pop it in the oven Christmas morning—no stress, just joy.

Ingredients & Their Purpose

• 1 lb Ground Sausage – Adds rich, savory flavor and satisfying protein.
• 1 tsp Mustard Powder – Enhances depth with a subtle tangy warmth.
• ½ tsp Kosher Salt – Balances and brings out the other flavors.
• 4 Large Eggs, beaten – Binds the casserole together while adding moisture and fluffiness.
• 2 cups Whole Milk – Makes the egg mixture creamy and custard-like.
• 6 slices White Bread, toasted and cubed – The base that soaks up the egg and adds texture.
• 1 cup Mild Cheddar Cheese, shredded – Melts into gooey goodness, giving that classic breakfast flavor.

How to Make Christmas Breakfast Casserole

1. Cook the Sausage: In a medium skillet over medium heat, crumble the ground sausage and cook until browned and no longer pink. Drain off the excess fat.
2. Prepare the Egg Mixture: In a large mixing bowl, whisk together the mustard powder, kosher salt, beaten eggs, and whole milk until fully combined.
3. Combine Ingredients: Add the cooked sausage, cubed toasted bread, and shredded cheddar cheese into the egg mixture. Stir gently until everything is evenly coated.
4. Assemble the Casserole: Pour the mixture into a greased 9×13 inch baking dish. Smooth out the top with a spatula.
5. Chill Overnight: Cover the dish with plastic wrap or foil and refrigerate for at least 8 hours, preferably overnight. This allows the bread to absorb all the flavors.
6. Bake: The next morning, preheat your oven to 350°F (175°C). Remove the casserole from the fridge and let it sit at room temperature for 20 minutes. Bake uncovered for 45–50 minutes, or until golden brown and the center is set.

Pro Tips for the Best Breakfast Casserole

• Use stale or toasted bread – It holds up better and soaks up more flavor.
• Make it ahead – Letting it sit overnight improves texture and flavor.
• Customize your mix-ins – Add cooked bell peppers, mushrooms, or even a dash of hot sauce for a kick.
• Test for doneness – Insert a knife in the center; it should come out clean.

Serving Suggestions

Pair this easy Christmas casserole with:

• Fresh fruit or fruit salad for a refreshing contrast
• Hot coffee or spiced cider to warm your morning
• Maple-glazed bacon or a side of crispy hash browns for extra indulgence