This delightful Christmas brunch casserole is perfect for a festive morning with family and friends. Combining savory breakfast sausage, creamy cheddar cheese, and fluffy bread cubes, this dish is both hearty and comforting. It's easy to prepare and can be made ahead of time, allowing you to enjoy the holiday without spending too much time in the kitchen.
Most of the ingredients for this recipe are common household items, but you might need to pick up a few things at the supermarket. Make sure to get breakfast sausage, which is typically found in the refrigerated section. Additionally, ensure you have enough shredded cheddar cheese and cubed bread on hand, as these are essential for the casserole's texture and flavor.

Ingredients For Christmas Brunch Casserole
Eggs: Provide the base and structure for the casserole.
Milk: Adds creaminess and helps bind the ingredients together.
Breakfast sausage: Adds a savory and hearty flavor to the dish.
Cheddar cheese: Melts into the casserole, adding a rich and creamy texture.
Salt: Enhances the overall flavor of the casserole.
Black pepper: Adds a hint of spice and depth to the dish.
Bread cubes: Provide structure and absorb the egg mixture, creating a fluffy texture.
Technique Tip for This Casserole
To ensure your casserole has a perfectly fluffy texture, make sure to use day-old bread. Fresh bread can be too moist and may result in a soggy casserole. If you only have fresh bread, you can dry it out by toasting the bread cubes in the oven at 300°F (150°C) for about 10 minutes before adding them to the mixture.
Suggested Side Dishes
Alternative Ingredients
large eggs - Substitute with flax eggs: Mix 1 tablespoon of ground flaxseed with 3 tablespoons of water for each 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 still provides a creamy texture.
breakfast sausage - Substitute with turkey sausage: Turkey sausage is a leaner alternative that still offers a similar flavor profile.
shredded cheddar cheese - Substitute with shredded mozzarella cheese: Mozzarella provides a milder flavor and melts well, making it a good alternative.
salt - Substitute with soy sauce: Soy sauce can add a different depth of umami flavor while still providing the necessary saltiness.
black pepper - Substitute with white pepper: White pepper offers a similar heat but with a slightly different flavor profile, often described as more earthy.
cubed bread - Substitute with cubed gluten-free bread: For those with gluten sensitivities, gluten-free bread works well and absorbs the egg mixture similarly.
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How to Store or Freeze This Casserole
- Allow the casserole to cool completely before storing. This helps prevent condensation, which can make the bread 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 3-4 days.
- For longer storage, cut the casserole into individual portions and wrap each piece in plastic wrap. Then, place the wrapped pieces in a freezer-safe bag or container. This method ensures easy grab-and-go servings.
- Label the freezer-safe bag or container with the date and contents to keep track of its freshness.
- When ready to enjoy, thaw the casserole in the refrigerator overnight. This gradual thawing helps maintain the texture and flavor.
- Reheat individual portions in the microwave for 1-2 minutes, or until heated through. For a crispier top, reheat in the oven at 350°F (175°C) for about 10-15 minutes.
- If reheating the entire casserole, cover it with aluminum foil and bake at 350°F (175°C) for 20-30 minutes, or until heated through. Remove the foil during the last 10 minutes to allow the top to crisp up.
- Avoid reheating more than once to maintain the best quality and safety of the casserole.
How to Reheat Leftovers
Oven Method: Preheat your oven to 350°F (175°C). Place the leftover Christmas Brunch Casserole in an oven-safe dish. Cover it with aluminum foil to prevent it from drying out. Heat for about 20-25 minutes, or until the casserole is warmed through. Remove the foil for the last 5 minutes to let the top get crispy again.
Microwave Method: Place a portion of the casserole on a microwave-safe plate. Cover it with a microwave-safe lid or a damp paper towel to retain moisture. Heat on medium power for 2-3 minutes, checking halfway through to ensure even heating. If needed, continue heating in 30-second increments until hot.
Stovetop Method: Heat a non-stick skillet over medium heat. Add a small amount of butter or olive oil to the pan. Place the leftover casserole in the skillet and cover with a lid. Heat for about 5-7 minutes, flipping occasionally to ensure even warming. This method can help restore some of the original texture.
Air Fryer Method: Preheat your air fryer to 350°F (175°C). Place the casserole in the air fryer basket, making sure not to overcrowd. Heat for 5-7 minutes, checking halfway through to ensure it doesn't overcook. This method will give you a crispy top similar to the original bake.
Toaster Oven Method: Preheat your toaster oven to 350°F (175°C). Place the casserole in a toaster oven-safe dish. Cover with aluminum foil and heat for 15-20 minutes. Remove the foil for the last 5 minutes to crisp up the top.
Essential Tools for Making This Casserole
Oven: Used to bake the casserole at 350°F (175°C) until it is golden and set.
Large mixing bowl: Used to whisk together the eggs, milk, salt, and pepper, and to mix in the cooked sausage, cheese, and bread cubes.
Whisk: Used to blend the eggs, milk, salt, and pepper together smoothly.
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.
Measuring cups: Used to measure out the milk and shredded cheddar cheese accurately.
Measuring spoons: Used to measure the salt and black pepper precisely.
Knife: Used to cube the bread into even pieces.
Cutting board: Used as a surface to cube the bread.
Skillet: Used to cook and crumble the breakfast sausage before adding it to the casserole mixture.
Spatula: Used to mix the cooked sausage, cheese, and bread cubes into the egg mixture evenly.
How to Save Time on Making This Casserole
Prepare ingredients ahead: Cook and crumble the breakfast sausage the night before.
Use pre-shredded cheese: Save time by using pre-shredded cheddar cheese instead of shredding your own.
Pre-cube the bread: Cube the bread a day in advance and store it in an airtight container.
Mix dry ingredients: Combine the bread cubes, sausage, and cheese in a bowl the night before.
Quick assembly: In the morning, just whisk the eggs and milk, then mix with the pre-prepared dry ingredients.
Christmas Brunch Casserole
Ingredients
Main Ingredients
- 8 large eggs
- 2 cups milk
- 1 lb breakfast sausage, cooked and crumbled
- 2 cups shredded cheddar cheese
- 1 teaspoon salt
- ½ teaspoon black pepper
- 4 cups cubed bread
Instructions
- Preheat oven to 350°F (175°C).
- In a large mixing bowl, whisk together eggs, milk, salt, and pepper.
- Add cooked sausage, cheese, and bread cubes to the bowl. Mix well.
- Pour mixture into a greased baking dish.
- Bake for 45 minutes, or until the top is golden and the casserole is set.
- Let cool for a few minutes before serving.
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