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Easy Ham and Swiss Croissant Breakfast Casserole Recipe Overnight Perfect for Busy Mornings

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A buttery, cheesy breakfast casserole made with croissants, ham, and Swiss cheese soaked overnight in an egg custard, perfect for busy mornings and easy to prepare ahead.

Ingredients

Scale
  • 6 large butter croissants (day-old or slightly stale)
  • 2 cups diced ham (black forest or honey ham preferred)
  • 1 ½ cups shredded Swiss cheese (Gruyère can be used as an alternative)
  • 6 large eggs, room temperature
  • 2 cups whole milk or half-and-half
  • 1 tablespoon Dijon mustard
  • ½ teaspoon salt, or to taste
  • ¼ teaspoon freshly ground black pepper
  • ½ teaspoon garlic powder (optional)
  • 1 teaspoon fresh thyme, chopped (optional)

Instructions

  1. Tear the croissants into bite-sized pieces and place them evenly in a 9×13-inch baking dish.
  2. Scatter the diced ham and shredded Swiss cheese evenly over the croissants.
  3. In a large bowl, whisk together eggs, milk or half-and-half, Dijon mustard, salt, black pepper, and garlic powder until smooth and slightly frothy.
  4. Slowly pour the custard mixture evenly over the croissant mixture, pressing down lightly to help croissants absorb the custard.
  5. Cover the dish tightly with plastic wrap or foil and refrigerate for at least 6 hours or overnight.
  6. Remove the casserole from the fridge about 20 minutes before baking to take the chill off.
  7. Preheat oven to 350°F (175°C). Bake uncovered for 45-50 minutes until the top is golden brown and a knife inserted in the center comes out clean.
  8. Let the casserole rest for 10 minutes before slicing and serving.

Notes

Use day-old croissants for best texture; fresh croissants may become soggy. If top browns too fast, tent with foil. For gluten-free, substitute croissants with gluten-free bread. Vegetarian version can use sautéed mushrooms, spinach, and sun-dried tomatoes instead of ham. Leftovers store well refrigerated for 3 days or frozen for up to 2 months.

Nutrition

Keywords: ham, Swiss cheese, croissant, breakfast casserole, overnight casserole, easy breakfast, brunch, make ahead

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