Christmas Breakfast Casserole: Festive & Easy Holiday Brunch

The best holiday mornings start with something warm, hearty, and hands-off. This Christmas Breakfast Casserole checks every box: simple prep, reliable results, and flavors everyone loves. Imagine eggs, savory sausage, melty cheese, and soft bread soaking up all that goodness overnight.

In the morning, you just bake and enjoy while the house fills with the coziest smell. It’s the kind of dish that lets you slow down, pour coffee, and stay in your slippers a little longer.

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Christmas Breakfast Casserole: Festive & Easy Holiday Brunch

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Prep Time 15 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr

Servings 8 servings

Ingredients

  

• 1 pound (450 g) breakfast sausage (pork or turkey), casings removed
• 1 medium yellow onion, finely chopped
• 1 red bell pepper, diced
• 8 cups cubed day-old bread (French bread, country loaf, or brioche), about 1-inch cubes
• 2 cups (225 g) shredded cheddar cheese (or a cheddar-jack blend)
• 10 large eggs
• 2 1/2 cups (590 ml) milk (whole or 2%)
• 1/2 cup (120 ml) heavy cream (optional but extra creamy)
• 1 teaspoon kosher salt (plus more to taste)
• 1/2 teaspoon black pepper
• 1 teaspoon Dijon mustard
• 1/2 teaspoon garlic powder
• 1/2 teaspoon smoked paprika (optional, for warmth and color)
• 2 tablespoons chopped fresh parsley (optional, for garnish)
• Butter or cooking spray for greasing the pan

Instructions

 

• Prep the pan: Grease a 9x13-inch baking dish with butter or cooking spray. Set aside.
• Cook the sausage: In a large skillet over medium heat, cook the sausage, breaking it into crumbles, until browned and cooked through, 6–8 minutes. Drain excess fat if needed.
• Sauté the veggies: Add the onion and red pepper to the skillet. Cook until softened, 4–5 minutes. Season lightly with salt and pepper. Remove from heat and let cool slightly.
• Build the base: Spread the cubed bread evenly in the prepared baking dish. Scatter the sausage and veggie mixture over the bread. Sprinkle 1 1/2 cups of the cheese on top.
• Make the custard: In a large bowl, whisk together eggs, milk, cream, salt, pepper, Dijon, garlic powder, and smoked paprika until smooth.
• Combine: Pour the egg mixture evenly over the bread and sausage. Gently press down with a spatula so the bread soaks it up.
• Chill: Cover tightly with foil or plastic wrap and refrigerate for at least 4 hours, preferably overnight (8–12 hours) for best texture.
• Bake: Preheat the oven to 350°F (175°C). Uncover the casserole, sprinkle the remaining 1/2 cup cheese over the top, and bake for 45–55 minutes, until the center is set and the top is golden. A knife inserted in the center should come out without liquid egg.
• Rest and serve: Let it rest 10–15 minutes before slicing. Garnish with fresh parsley and serve warm.

Why This Recipe Works

• Make-ahead convenience: Assemble it the night before, then bake in the morning. Perfect for busy holiday schedules.
• Balanced texture: The bread soaks up the custard, creating a creamy center and a lightly crisp top.
• Crowd-pleasing flavors: Savory sausage, fluffy eggs, and cheddar are a classic combo that appeals to all ages.
• Flexible: Swap in veggies, different cheeses, or bacon to match your family’s tastes.
• Foolproof: Clear ratios and simple steps help you get consistent results every time.

Ingredients

• 1 pound (450 g) breakfast sausage (pork or turkey), casings removed
• 1 medium yellow onion, finely chopped
• 1 red bell pepper, diced
• 8 cups cubed day-old bread (French bread, country loaf, or brioche), about 1-inch cubes
• 2 cups (225 g) shredded cheddar cheese (or a cheddar-jack blend)
• 10 large eggs
• 2 1/2 cups (590 ml) milk (whole or 2%)
• 1/2 cup (120 ml) heavy cream (optional but extra creamy)
• 1 teaspoon kosher salt (plus more to taste)
• 1/2 teaspoon black pepper
• 1 teaspoon Dijon mustard
• 1/2 teaspoon garlic powder
• 1/2 teaspoon smoked paprika (optional, for warmth and color)
• 2 tablespoons chopped fresh parsley (optional, for garnish)
• Butter or cooking spray for greasing the pan

Instructions

1. Prep the pan: Grease a 9×13-inch baking dish with butter or cooking spray.Set aside.
2. Cook the sausage: In a large skillet over medium heat, cook the sausage, breaking it into crumbles, until browned and cooked through, 6–8 minutes. Drain excess fat if needed.
3. Sauté the veggies: Add the onion and red pepper to the skillet. Cook until softened, 4–5 minutes.Season lightly with salt and pepper. Remove from heat and let cool slightly.
4. Build the base: Spread the cubed bread evenly in the prepared baking dish. Scatter the sausage and veggie mixture over the bread.Sprinkle 1 1/2 cups of the cheese on top.
5. Make the custard: In a large bowl, whisk together eggs, milk, cream, salt, pepper, Dijon, garlic powder, and smoked paprika until smooth.
6. Combine: Pour the egg mixture evenly over the bread and sausage. Gently press down with a spatula so the bread soaks it up.
7. Chill: Cover tightly with foil or plastic wrap and refrigerate for at least 4 hours, preferably overnight (8–12 hours) for best texture.
8. Bake: Preheat the oven to 350°F (175°C). Uncover the casserole, sprinkle the remaining 1/2 cup cheese over the top, and bake for 45–55 minutes, until the center is set and the top is golden.A knife inserted in the center should come out without liquid egg.
9. Rest and serve: Let it rest 10–15 minutes before slicing. Garnish with fresh parsley and serve warm.

Storage Instructions

• Refrigerator: Cool completely, then cover and refrigerate for up to 4 days.
• Freezer: Wrap individual portions tightly and freeze for up to 2 months. Thaw overnight in the fridge.
• Reheating: Microwave slices for 60–90 seconds until hot, or reheat in a 325°F (165°C) oven for 15–20 minutes.Add a splash of milk and cover with foil to prevent drying out.

Why This is Good for You

• Protein-rich: Eggs and sausage deliver staying power, which helps balance a sugary holiday spread.
• Customizable veggies: Add spinach, mushrooms, or broccoli to boost fiber and micronutrients.
• Steady energy: The mix of protein, fat, and carbs keeps you full through gift-opening and beyond.
• Control the ingredients: Choose lean sausage, use part-skim cheese, or swap in whole-grain bread to lighten it up.

Common Mistakes to Avoid

• Using fresh, super-soft bread: Fresh bread can turn mushy. Day-old or lightly toasted cubes hold up better.
• Skipping the rest time: Without an overnight soak, the center can be dry and the texture uneven.
• Overbaking: This dries out the casserole. Start checking at 45 minutes and pull it when the center is set.
• Not seasoning the custard: Bland eggs mean a bland dish.Taste the sausage mixture and season the custard well.
• Overloading with wet add-ins: Too many juicy veggies (like tomatoes) can water it down. Sauté and drain well.

Alternatives

• Meat swaps: Use bacon, ham, or cooked chicken sausage. For a lighter option, choose turkey sausage.
• Vegetarian: Skip the sausage and add 2 cups sautéed mushrooms, 2 cups spinach, and an extra 1/2 teaspoon smoked paprika.
• Dairy-free: Use unsweetened almond or oat milk, skip the cream, and choose dairy-free cheese or omit cheese entirely.
• Gluten-free: Substitute your favorite sturdy gluten-free bread.
• Flavor twists: Try pepper jack and green chiles for a Southwest vibe, or Swiss with sautéed leeks for something cozier.
• Individual portions: Bake in greased muffin tins at 350°F (175°C) for 20–25 minutes.

FAQ

Can I bake it right away instead of chilling overnight?

Yes, but the texture will be slightly less custardy.

If you’re short on time, let it sit at room temperature for at least 30 minutes before baking to help the bread absorb the custard.

What bread works best?

Use a sturdy loaf like French bread, sourdough, or brioche. Day-old bread is ideal. If your bread is fresh, toast the cubes in a 300°F (150°C) oven for 10–12 minutes.

How do I know it’s done?

The edges will be golden, and the center should be set but not dry.

A knife inserted in the middle should come out without liquid egg, and the internal temperature should reach about 160–170°F (71–77°C).

Can I halve the recipe?

Absolutely. Use an 8×8-inch dish and reduce the bake time to 35–45 minutes. Keep an eye on the center for doneness.

How can I make it spicier?

Use hot Italian or spicy breakfast sausage, add red pepper flakes to the custard, or swap in pepper jack cheese.

A drizzle of hot sauce at the table also works.

Can I prepare it two days in advance?

You can assemble it 24 hours ahead. For longer than that, the bread can break down. If you need a longer lead time, cook the sausage and prep the veggies early, then assemble the night before baking.

What sides go well with this?

Fresh fruit salad, a simple green salad, roasted potatoes, or cinnamon rolls make great pairings.

Keep drinks easy with coffee, orange juice, or a holiday mimosa.

Final Thoughts

This Christmas Breakfast Casserole is cozy, reliable, and a true time-saver on a busy morning. It feeds a crowd without keeping you in the kitchen, and it’s easy to tweak for different tastes. Make it once, and it may become your new holiday tradition.

Warm plates, happy people, and a little extra time together—that’s the real gift.