Growing up in a southern household, on Christmas morning, it gradually became a tradition for my older sister to whip up her infamous sausage breakfast casserole before we commenced opening up presents.

Now, as an adult, I cherish those holiday mornings even more. There’s something magical about sipping mimosas while enjoying my sister’s signature dish. The way she perfectly positions the melted cheeses, caramelized pepper and onions, and fluffy eggs creates more than just breakfast — it’s a warm reminder of family, tradition, and holiday joy.

What makes this dish particularly special is how it brings everyone together. The anticipation builds as the aroma fills the house, drawing sleepy family members to the kitchen one by one. Even the kids, eager to tear into their presents, can’t help but pause to enjoy this beloved breakfast tradition.

My sister insists the secret isn’t in any particular ingredient but in the preparation done with love and the joy of seeing everyone’s faces light up as they take their first bite. She’s probably right — some dishes just taste better when they’re made by someone who cares.

Breakfast casserole is a favorite for holiday mornings for a reason— and we’re dropping the secrets of the beloved dish ahead.

Christmas Sausage Breakfast Casserole

Ingredients

• 1 pound breakfast sausage
• 8 slices bacon, chopped
• 1 pound ham, diced
• 1 large yellow onion, chopped (2 cups)
• 2 red bell peppers, diced (2 cups)
• 8 large eggs
• 2 cups whole milk
• 2 teaspoons Dijon mustard
• 1 teaspoon kosher salt
• ½ teaspoon black pepper
• 4 slices white bread, cubed (about 5 cups)
• 2 cups sharp cheddar cheese, shredded
• 1 cup mozzarella cheese, shredded
• Cooking spray
• Green onions for garnish

Instructions

1. Cook bacon in a large skillet until crispy. Remove and set aside.
2. In the same skillet, brown breakfast sausage over medium heat. Remove and set aside.
3. Sauté diced ham until lightly browned.
4. In the remaining fat, cook bell peppers and onions until tender, about 5-7 minutes.
5. Whisk together eggs, milk, Dijon mustard, salt, and pepper in a large bowl.
6. Fold in the bread cubes, all meats, and 2 cups of the mixed cheeses.
7. Coat a 9×13 baking dish with cooking spray. Add the egg mixture.
8. Top with remaining cheese, cover with foil and refrigerate overnight.
9. Preheat oven to 350°F. Remove foil and bake for 45-50 minutes until golden and set.
10. Let rest for 10 minutes before serving. Garnish with green onions.