This Christmas breakfast sausage casserole is the perfect dish to start your holiday morning. It's a hearty and comforting meal that combines savory sausage, eggs, and cheese with the soft texture of bread. Prepare it the night before and simply bake it in the morning for a stress-free breakfast that will delight your family and guests.
Most of the ingredients for this recipe are common pantry staples, but you might need to pick up a few items. Dry mustard is a spice that adds a subtle tangy flavor and can usually be found in the spice aisle. Make sure to get breakfast sausage, which is typically seasoned with sage and other spices, rather than regular sausage. Cheddar cheese should be shredded for easy melting.

Ingredients For Christmas Breakfast Sausage Casserole
Breakfast sausage: A seasoned sausage typically used for breakfast dishes, adding a savory and slightly spicy flavor.
Eggs: Provides structure and richness to the casserole.
Milk: Adds moisture and helps to create a custard-like base.
Salt: Enhances the overall flavor of the dish.
Dry mustard: Adds a subtle tangy flavor that complements the sausage.
Bread: Cubed bread forms the base of the casserole, absorbing the egg mixture and providing texture.
Cheddar cheese: Shredded cheese that melts beautifully, adding a rich and creamy element.
Technique Tip for This Recipe
To ensure the bread cubes absorb the egg mixture evenly, gently press down on the bread with a spatula after pouring the mixture. This helps to distribute the liquid throughout the casserole, resulting in a more uniform texture.
Suggested Side Dishes
Alternative Ingredients
breakfast sausage - Substitute with ground turkey: Ground turkey is a leaner option and can be seasoned to mimic the flavors of breakfast sausage.
breakfast sausage - Substitute with vegetarian sausage: For a vegetarian option, use plant-based sausage to maintain the texture and flavor.
eggs - Substitute with flax eggs: Mix 1 tablespoon of ground flaxseed with 3 tablespoons of water per egg. This is a great vegan alternative that helps bind the casserole.
milk - Substitute with almond milk: Almond milk is a dairy-free option that works well in casseroles and has a mild flavor.
salt - Substitute with soy sauce: Soy sauce can add a salty and umami flavor, but use it sparingly to avoid overpowering the dish.
dry mustard - Substitute with Dijon mustard: Dijon mustard can provide a similar tangy flavor, though it is more moist than dry mustard.
bread - Substitute with gluten-free bread: For a gluten-free option, use gluten-free bread to maintain the texture and structure of the casserole.
cheddar cheese - Substitute with mozzarella cheese: Mozzarella cheese can provide a milder flavor and a creamy texture, making it a good alternative.
Other Alternative Recipes Similar to This Casserole
How to Store / Freeze This Recipe
- Allow the casserole to cool completely after baking. This ensures that condensation doesn't form inside the storage container, which can make the casserole soggy.
- For short-term storage, cover the baking dish tightly with aluminum foil or plastic wrap. Alternatively, transfer the casserole to an airtight container. Store in the refrigerator for up to 3-4 days.
- For freezing, cut the casserole into individual portions. Wrap each portion tightly in plastic wrap, then place them in a freezer-safe bag or container. This makes it easy to reheat single servings.
- Label the freezer bags or containers with the date and contents. This helps you keep track of how long the casserole has been stored.
- To reheat from the refrigerator, preheat your oven to 350°F (175°C). Place the casserole in an oven-safe dish and cover with foil. Bake for about 20-25 minutes or until heated through.
- To reheat from frozen, you have two options:
- Thaw the casserole in the refrigerator overnight. Then follow the same reheating instructions as for refrigerated casserole.
- Reheat directly from frozen by placing the casserole in an oven-safe dish, covering with foil, and baking at 350°F (175°C) for about 45-60 minutes. Check to ensure it's heated through.
- For a quicker reheating option, use the microwave. Place a portion of the casserole on a microwave-safe plate, cover with a microwave-safe lid or another plate, and heat on medium power for 2-3 minutes. Check and continue heating in 30-second intervals until warmed through.
How to Reheat Leftovers
Preheat your oven to 350°F (175°C). Place the leftover Christmas Breakfast Sausage Casserole in an oven-safe dish. Cover with aluminum foil to retain moisture and bake for about 20-25 minutes or until heated through.
For a quicker option, use the microwave. Place a portion of the casserole on a microwave-safe plate. Cover with a microwave-safe lid or a damp paper towel to prevent drying out. Heat on medium power for 2-3 minutes, checking halfway through to ensure even heating.
If you prefer a crispy top, use a toaster oven. Preheat the toaster oven to 350°F (175°C). Place a portion of the casserole on a toaster oven-safe tray. Cover loosely with foil and heat for 15-20 minutes. Remove the foil for the last 5 minutes to crisp up the top.
For stovetop reheating, use a non-stick skillet. Add a small amount of butter or olive oil to the skillet over medium heat. Place a portion of the casserole in the skillet, cover, and heat for about 5-7 minutes, flipping halfway through to ensure even heating.
If you have an air fryer, preheat it to 350°F (175°C). Place a portion of the casserole in the air fryer basket. Heat for 5-7 minutes, shaking the basket halfway through to ensure even heating. This method will give you a crispy exterior while keeping the inside moist.
Best Tools for This Recipe
Oven: Used to bake the casserole at a consistent temperature of 350°F (175°C).
Skillet: Essential for cooking the sausage until browned.
Mixing bowl: Needed to beat the eggs and mix them with milk, salt, and dry mustard.
Whisk: Useful for thoroughly mixing the egg mixture.
Baking dish: The container where you will assemble and bake the casserole.
Knife: Handy for cubing the bread slices.
Cutting board: Provides a safe surface for cutting the bread.
Measuring cups: Necessary for accurately measuring the milk and cheese.
Measuring spoons: Needed to measure out the salt and dry mustard.
Spatula: Useful for spreading the sausage and cheese evenly over the bread cubes.
Aluminum foil: Used to cover the baking dish when refrigerating overnight.
How to Save Time on Making This Recipe
Cook sausage in advance: Prepare the sausage the night before and store it in the fridge to save time in the morning.
Use pre-shredded cheese: Opt for pre-shredded cheddar cheese to cut down on prep time.
Pre-cube the bread: Cube the bread the night before and store it in an airtight container.
Mix egg mixture ahead: Combine the eggs, milk, salt, and dry mustard the night before and refrigerate.
Use a disposable baking dish: Save on cleanup time by using a disposable baking dish.

Christmas Breakfast Sausage Casserole
Ingredients
Main Ingredients
- 1 pound breakfast sausage
- 6 eggs
- 2 cups milk
- 1 teaspoon salt
- 1 teaspoon dry mustard
- 6 slices bread, cubed
- 2 cups cheddar cheese, shredded
Instructions
- Preheat oven to 350°F (175°C).
- In a skillet, cook sausage over medium heat until browned. Drain excess fat.
- In a mixing bowl, beat the eggs. Add milk, salt, and dry mustard. Mix well.
- Place bread cubes in a greased baking dish. Sprinkle with cooked sausage and cheese.
- Pour egg mixture over the bread, sausage, and cheese. Cover and refrigerate overnight.
- Bake in preheated oven for 45 minutes or until set. Let stand for 10 minutes before serving.
Nutritional Value
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