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Simple Ham and Cheese Croissant Casserole

A golden-brown slice of Ham and Cheese Croissant Casserole with melted cheese stretching out.
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Make this easy Ham and Cheese Croissant Casserole for a satisfying breakfast or brunch. Day-old croissants soak up a rich egg mixture, creating a moist, savory bake perfect for feeding a crowd.

Ingredients

Scale
  • 12 large croissants, day-old is best
  • 1 pound deli ham, diced
  • 2 cups shredded Gruyère cheese
  • 1 cup shredded sharp cheddar cheese
  • 6 large eggs
  • 2 1/2 cups whole milk
  • 1 teaspoon Dijon mustard
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/4 teaspoon nutmeg

Instructions

  1. Grease a 9×13 inch baking dish. Tear the croissants into bite-sized pieces and spread them evenly in the prepared dish.
  2. Sprinkle the diced ham and both cheeses over the croissant pieces. Gently toss to distribute.
  3. In a large bowl, whisk together the eggs, milk, Dijon mustard, salt, pepper, and nutmeg until well combined. This creates your rich egg casserole base.
  4. Slowly pour the egg mixture evenly over the croissant and meat mixture in the baking dish. Press down lightly with a spatula to help the croissants 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 fully soak. This step is key for a moist bake.
  6. When ready to bake, preheat your oven to 350 degrees Fahrenheit (175 degrees Celsius). Remove the plastic wrap.
  7. Bake 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 Ham and Cheese Croissant Casserole rest for 10 minutes before slicing and serving.

Notes

  • For a make-ahead option, assemble the entire casserole the night before and keep it covered in the refrigerator. Add 5-10 minutes to the baking time if baking straight from the fridge.
  • Use good quality, buttery croissants for the best flavor in this savory croissant breakfast casserole recipe.
  • You can substitute Gruyère with Swiss cheese if needed.

Nutrition

Find it online: https://miameal.com/ham-and-cheese-croissant-casserole/