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Overnight Ham and Cheese Croissant Breakfast Casserole

A close-up of a golden-brown slice of Croissant Breakfast Casserole with visible bacon and melted cheddar cheese.
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Make this easy, make-ahead croissant breakfast casserole the night before. It combines buttery croissants with savory ham and cheese in a rich egg custard, perfect for a stress-free weekend brunch or holiday breakfast.

Ingredients

Scale
  • 12 large croissants, torn into bite-sized pieces
  • 1 cup diced fully cooked ham
  • 1 cup shredded sharp cheddar cheese
  • 1 cup shredded Monterey Jack cheese
  • 8 large eggs
  • 2 cups whole milk
  • 1 teaspoon dry mustard powder
  • 1/2 teaspoon black pepper
  • 1/4 teaspoon garlic powder
  • 1/2 teaspoon salt

Instructions

  1. Lightly grease a 9×13 inch baking dish. Distribute the torn croissant pieces evenly in the bottom of the dish.
  2. Sprinkle the diced ham and both types of shredded cheese over the croissants.
  3. In a large bowl, whisk together the eggs, whole milk, dry mustard powder, black pepper, garlic powder, and salt until fully combined.
  4. Slowly pour the egg mixture evenly over the croissant and meat/cheese layers in the baking dish. Gently press down on the croissants to help them absorb the liquid.
  5. Cover the dish tightly with plastic wrap. Refrigerate for at least 4 hours, or preferably overnight, to allow the croissants to soak up the custard.
  6. When ready to bake, preheat your oven to 350°F (175°C). Remove the plastic wrap.
  7. Bake uncovered for 40 to 50 minutes, or until the casserole is puffed, golden brown on top, and a knife inserted near the center comes out clean.
  8. Let the casserole rest for 10 minutes before slicing and serving. This is a great holiday breakfast casserole option.

Notes

  • For a richer flavor, use a mix of Gruyère and cheddar cheese.
  • If you need to bake this immediately, let the assembled casserole sit at room temperature for 30 minutes before baking.
  • This recipe works well as a freezer friendly breakfast; assemble completely, cover tightly, and freeze up to one month. Thaw overnight in the refrigerator before baking as directed.

Nutrition

Find it online: https://mdlatdmm.com/croissant-breakfast-casserole/