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Baked croissant breakfats casserole in a baking dish with blue striped plates on the side.
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Croissant Breakfast Casserole

This Croissant Breakfast Casserole is the perfect make-ahead recipe to easily feed a crowd. It's perfect for entertaining or meal prep to reheat on busy weekday mornings. Easy to customize, I know your family will love it.
Course Breakfast
Cuisine American
Prep Time 15 minutes
Cook Time 43 minutes
Servings 8

Ingredients

  • 8 large buttery croissants torn into 2–3 inch pieces
  • 8 ounces thick-cut bacon chopped
  • 1 cup shredded mozzarella cheese
  • ½ cup sharp white cheddar cheese shredded
  • 1 red bell pepper finely diced
  • 7 large eggs
  • 1½ cups whole milk
  • ½ cup heavy cream
  • 1 tablespoon melted butter
  • 2 teaspoons Dijon mustard
  • 1½ teaspoons Everything Bagel seasoning
  • 1 –2 teaspoons Frank’s RedHot sauce
  • 1 teaspoon kosher salt
  • ¼ teaspoon freshly ground black pepper
  • Fresh chives thinly sliced (for garnish)

Instructions

  • Preheat oven to 350°F. Grease a 9×13-inch baking dish with nonstick cooking spray.
  • In a skillet over medium heat, cook the bacon until crispy, about 4–5 minutes. Using a slotted spoon, transfer bacon to the prepared baking dish.
  • In a small bowl, combine the mozzarella and white cheddar cheese. Sprinkle half of the cheese evenly over the bacon. Scatter the diced red bell pepper on top.
  • Arrange the croissant pieces over the bacon and peppers, allowing some edges to stick up for a golden finish.
  • In a large bowl, whisk together the eggs, milk, heavy cream, melted butter, Dijon mustard, Frank’s RedHot, salt, and black pepper.
  • Pour the custard evenly over the croissants, gently pressing them down so they absorb the liquid.
  • Sprinkle the remaining cheese evenly over the top. Then sprinkle with Everything but the bagel seasoning.
  • Bake uncovered for 40–45 minutes, until puffed, golden brown, and set in the center. If browning too quickly, loosely tent with foil after about 30 minutes.
  • Let rest for 5–10 minutes, garnish with fresh chives, and serve warm.

Video

Notes

This casserole can be assembled ahead, covered, and refrigerated overnight. Add 5–10 minutes to bake time if baking straight from the fridge.
The Frank’s RedHot adds flavor, not heat — perfect for brunch.
Croissants should be slightly stale for best absorption.