This delightful Christmas breakfast sausage casserole is the perfect way to start your holiday morning. It's a hearty and flavorful dish that combines savory sausage, eggs, and cheese with the comforting texture of bread. Easy to prepare and sure to please a crowd, this casserole will become a festive favorite.
Most of the ingredients for this recipe are common pantry staples, but you might need to pick up breakfast sausage and dry mustard if they are not already in your kitchen. Breakfast sausage can be found in the refrigerated section of your supermarket, usually near the bacon and other breakfast meats. Dry mustard is typically located in the spice aisle.

Ingredients For Christmas Breakfast Sausage Casserole
Breakfast sausage: Adds a savory and slightly spicy flavor to the casserole.
Eggs: Provide structure and richness to the dish.
Milk: Helps to create a creamy texture and binds the ingredients together.
Salt: Enhances the overall flavor of the casserole.
Dry mustard: Adds a subtle tangy flavor that complements the sausage.
Bread: Cubed bread absorbs the egg mixture and adds a soft, comforting texture.
Cheddar cheese: Melts into the casserole, adding a rich, cheesy flavor.
Technique Tip for This Recipe
When cooking the sausage, make sure to break it up into small, even pieces as it browns. This ensures that the sausage is evenly distributed throughout the casserole, giving each bite a consistent flavor. Additionally, allowing the bread cubes to soak in the egg mixture for a few minutes before baking will help the casserole achieve a more cohesive 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 which provides a similar texture and flavor.
eggs - Substitute with flaxseed meal: Mix 1 tablespoon of flaxseed meal with 3 tablespoons of water for each egg to create a vegan alternative.
eggs - Substitute with silken tofu: Blend ¼ cup of silken tofu per egg to maintain the casserole's texture and moisture.
milk - Substitute with almond milk: Almond milk is a dairy-free alternative that works well in casseroles.
milk - Substitute with oat milk: Oat milk provides a creamy texture similar to cow's milk and is suitable for those with dairy allergies.
salt - Substitute with soy sauce: Soy sauce can add a savory umami flavor while reducing the need for additional salt.
salt - Substitute with sea salt: Sea salt can be used as a direct replacement with a slightly different mineral content.
dry mustard - Substitute with Dijon mustard: Use 1 teaspoon of Dijon mustard for every ½ teaspoon of dry mustard to add a tangy flavor.
dry mustard - Substitute with yellow mustard: Yellow mustard can be used in a pinch, though it has a milder flavor.
bread - Substitute with gluten-free bread: For a gluten-free option, use gluten-free bread to maintain the casserole's structure.
bread - Substitute with hash browns: Hash browns can add a different texture and are a good option for those avoiding bread.
shredded cheddar cheese - Substitute with shredded mozzarella: Mozzarella provides a milder flavor and melts well in casseroles.
shredded cheddar cheese - Substitute with vegan cheese: Use a plant-based cheese alternative for a dairy-free option.
Other Alternative Recipes Similar to This Casserole
How to Store / Freeze This Casserole
- Allow the casserole to cool completely before storing. This helps prevent condensation, which can make the dish soggy.
- For short-term storage, cover the baking dish tightly with aluminum foil or plastic wrap and place it in the refrigerator. It will stay fresh for up to 3 days.
- For longer storage, cut the casserole into individual portions and wrap each piece in plastic wrap. Then, place the wrapped pieces in a resealable freezer bag or airtight container. This method makes it easy to reheat single servings.
- Label the container or bag with the date to keep track of its freshness.
- When ready to enjoy, thaw the casserole in the refrigerator overnight if frozen. Reheat in a preheated oven at 350°F (175°C) for about 20 minutes, or until heated through. Alternatively, you can microwave individual portions on high for 2-3 minutes.
- To maintain the casserole's texture, avoid reheating it multiple times. Only reheat the amount you plan to consume.
- If you notice any changes in color, texture, or smell, it's best to discard the casserole to ensure food safety.
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 it with aluminum foil to prevent it from drying out, 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 it with a microwave-safe lid or another plate to retain moisture, and heat on medium power for 2-3 minutes. Check the temperature and continue heating in 30-second intervals until thoroughly warmed.
If you prefer a crispy top, use the broiler. First, reheat the casserole in the microwave for 2-3 minutes, then transfer it to an oven-safe dish and broil on high for 2-3 minutes until the top is golden and bubbly.
For stovetop reheating, place a non-stick skillet over medium heat. Add a small amount of butter or olive oil to the pan, then add the casserole. Cover and cook for 5-7 minutes, stirring occasionally, until heated through.
If you have an air fryer, preheat it to 350°F (175°C). Place the casserole in the air fryer basket, ensuring it's in a single layer. Heat for 5-7 minutes, shaking the basket halfway through, until the casserole is hot and the top is slightly crispy.
Best Tools for This Recipe
Oven: Used to bake the casserole at a consistent temperature of 350°F (175°C).
Skillet: Used to cook the sausage over medium heat until it is evenly browned.
Mixing bowl: Used to beat the eggs and mix them with milk, salt, mustard, bread cubes, cheese, and sausage.
Whisk: Used to beat the eggs and combine them with the other liquid ingredients.
Measuring cups: Used to measure out the milk and shredded cheddar cheese accurately.
Measuring spoons: Used to measure out the salt and dry mustard precisely.
Knife: Used to cube the bread and to check if the casserole is done by inserting it into the center.
Cutting board: Used as a surface to cube the bread.
9x13 inch baking dish: Used to hold the casserole mixture while it bakes in the oven.
Cooking spray: Used to grease the baking dish to prevent the casserole from sticking.
Spatula: Used to stir the ingredients together in the mixing bowl and to transfer the mixture into the baking dish.
How to Save Time on Making This Casserole
Cook sausage ahead: 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 cheese to cut down on prep time.
Pre-cube bread: Cube the bread the night before and store it in an airtight container.
Mix ingredients in advance: Combine eggs, milk, salt, and mustard the night before and refrigerate.
Use a disposable baking dish: Save on cleanup by using a disposable baking dish.
Set up the oven: Preheat the oven while you assemble the casserole.

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 shredded cheddar cheese
Instructions
- Preheat oven to 350°F (175°C).
- In a skillet, cook sausage over medium heat until evenly brown. Drain and set aside.
- In a mixing bowl, beat the eggs. Add milk, salt, and mustard. Stir in the bread cubes, cheese, and sausage. Pour into a greased 9x13 inch baking dish.
- Bake in preheated oven for 45 minutes, or until a knife inserted into the center comes out clean.
Nutritional Value
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