This Christmas breakfast casserole is a hearty make-ahead brunch dish with crisp-edged hash browns, fluffy eggs, savory sausage, and melted cheese. Assemble it the night before, refrigerate, and bake in the morning for a practical holiday breakfast that feeds a group.
For the best texture, thaw and drain frozen hash browns before mixing. Removing excess moisture helps the casserole bake evenly instead of turning watery in the middle.
Why You’ll Love This Holiday Breakfast
- Can be assembled the night before.
- Uses familiar breakfast ingredients.
- Easy to cut into portions for a crowd.
- Flexible with vegetables, meats, and cheeses.
Ingredients
- 1 pound breakfast sausage
- 1 (30-ounce) package frozen shredded hash brown potatoes, thawed and patted dry
- 8 large eggs
- 1 cup whole milk
- 1 cup shredded sharp cheddar cheese
- ½ cup shredded Monterey Jack cheese
- ½ small yellow onion, finely diced
- ½ red bell pepper, diced
- ½ teaspoon kosher salt
- ¼ teaspoon black pepper
- ½ teaspoon paprika
- Butter or cooking spray for the baking dish
- 2 tablespoons chopped green onions, optional
How to Make Christmas Breakfast Casserole
- Cook the sausage. Brown breakfast sausage in a skillet over medium heat, breaking it into small pieces. Drain excess fat and let it cool slightly.
- Prepare the vegetables. In the same skillet, cook onion and bell pepper for 3–4 minutes until softened. Set aside.
- Mix the egg custard. Whisk eggs, milk, salt, pepper, and paprika until evenly combined.
- Layer the casserole. Grease a 9-by-13-inch baking dish. Spread hash browns across the bottom, then add sausage, cooked vegetables, and cheeses.
- Add eggs. Pour the egg mixture evenly over the filling. Press gently with a spatula so the potatoes are moistened.
- Chill or bake. Cover and refrigerate for 8–12 hours for a make-ahead breakfast, or bake right away. Do not leave the raw egg mixture at room temperature.
- Bake. Heat oven to 350°F (175°C). Bake uncovered for 45–55 minutes, until the center is set and the top is golden. The center should reach 160°F (71°C).
- Rest and serve. Let stand for 10 minutes before slicing. Finish with green onions if desired.
Tips for a Perfect Breakfast Casserole
- Thaw and dry hash browns to prevent excess water.
- Drain sausage well so the casserole is not greasy.
- If baking straight from the refrigerator, allow extra time and check the center temperature.
- Let the casserole rest before cutting so portions hold together.
Easy Variations
Use cooked diced ham or crumbled bacon instead of sausage. Add spinach or mushrooms after sautéing to remove extra moisture. For a milder flavor, use mozzarella or Colby Jack in place of Monterey Jack. If you want a meatless version, add extra vegetables and season them well.
Make-Ahead and Storage
Assemble the casserole, cover, and refrigerate for up to 12 hours before baking. For longer planning, cook the sausage and vegetables ahead and refrigerate separately, then assemble the next day. Refrigerate leftovers promptly in a shallow covered container and use within 3–4 days. Reheat portions until steaming hot. Freeze baked portions in airtight containers for longer storage.
What to Serve with Christmas Breakfast Casserole
Serve with fresh fruit, orange slices, coffee, or a simple green salad for brunch. For a sweet holiday option, pair it with our overnight cinnamon roll French toast casserole or browse more Christmas recipes.
Frequently Asked Questions
Can I use fresh potatoes?
Yes. Shred russet potatoes, rinse away excess starch, and squeeze them very dry before using. Frozen hash browns are quicker and more consistent.
Can I bake it without chilling overnight?
Yes. Bake after assembling, checking the center for doneness. The overnight chill is for convenience and flavor melding, not a required step.
How do I know when the casserole is done?
The center should be set with no liquid egg remaining. For a dependable check, use an instant-read thermometer and look for 160°F (71°C) in the center.
Can I make it vegetarian?
Yes. Leave out sausage and add sautéed mushrooms, spinach, or extra peppers. Cook watery vegetables first so they do not release liquid during baking.
Save This Christmas Morning Breakfast
Keep this hash brown breakfast casserole on your holiday menu for a satisfying, make-ahead brunch. It is easy to portion, simple to customize, and convenient when the kitchen is busy on Christmas morning.
