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Overnight Ham and Cheese Croissant Breakfast Casserole

A close-up slice of rich Croissant Breakfast Casserole showing layers of flaky pastry, ham, and cheesy egg filling.
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Prepare this savory croissant breakfast casserole the night before for an easy, comforting meal when you wake up. It uses flaky croissants, ham, and cheese baked in a rich egg custard.

Ingredients

Scale
  • 1 (12 ounce) package of refrigerated croissants (about 8 croissants)
  • 8 ounces fully cooked ham, diced
  • 1 cup shredded Swiss cheese
  • 1 cup shredded sharp cheddar cheese
  • 6 large eggs
  • 2 cups half-and-half or whole milk
  • 1 teaspoon Dijon mustard
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper

Instructions

  1. Lightly grease a 9×13 inch baking dish.
  2. Tear the croissants into bite-sized pieces, about 1 inch each. Place the torn croissant pieces evenly in the prepared baking dish.
  3. Sprinkle the diced ham and the Swiss cheese evenly over the croissants.
  4. In a large bowl, whisk together the eggs, half-and-half, Dijon mustard, salt, and pepper until well combined.
  5. Pour the egg mixture slowly and evenly over the croissants and ham mixture in the baking dish. Gently press down on the croissants with a spatula to help them absorb the liquid.
  6. Cover the baking dish tightly with plastic wrap. Refrigerate for at least 4 hours, or preferably overnight.
  7. When ready to bake, preheat your oven to 350 degrees Fahrenheit. Remove the plastic wrap.
  8. Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
  9. Bake for 35 to 45 minutes, or until the casserole is puffed, golden brown, and a knife inserted near the center comes out clean.
  10. Let the casserole rest for 5 to 10 minutes before slicing and serving.

Notes

  • If you skip the overnight soak, let the assembled casserole sit at room temperature for 30 minutes before baking.
  • You can substitute the ham with cooked, crumbled sausage or cooked bacon for a different flavor profile.
  • For a richer flavor, use heavy cream instead of half-and-half in the egg mixture.

Nutrition

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