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The Ultimate Savory Overnight Croissant Breakfast Casserole (Ham, Bacon & Gruyère)

A close-up of a golden-brown slice of Croissant Breakfast Casserole with visible bacon pieces and creamy filling.
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Make your busy mornings simple with this make-ahead brunch bake. This casserole uses flaky croissants soaked in a savory egg custard with ham, bacon, and Gruyère cheese. Assemble it the night before and bake it fresh in the morning for an easy, crowd-pleasing breakfast.

Ingredients

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

Instructions

  1. Lightly grease a 9×13 inch baking dish. Arrange half of the torn croissants evenly in the bottom of the dish.
  2. Sprinkle half of the ham, bacon, Gruyère, and cheddar cheese over the croissant layer. Top with the remaining croissants, followed by the rest of the ham, bacon, and cheeses. Gently press the layers down.
  3. In a large bowl, whisk together the eggs, whole milk, heavy cream, dry mustard powder, garlic powder, salt, black pepper, and paprika until completely combined.
  4. Slowly pour the egg mixture evenly over the croissant and meat/cheese layers in the baking dish. Use a spatula to gently press down any dry spots to help the croissants absorb the custard.
  5. Cover the dish tightly with plastic wrap. Refrigerate for at least 4 hours, or preferably overnight.
  6. When ready to bake, preheat your oven to 350°F (175°C). Remove the plastic wrap.
  7. Bake uncovered for 45 to 55 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 idea.

Notes

  • For the best texture, use slightly stale or day-old croissants; they absorb the custard better than fresh ones.
  • If you skip the overnight rest, let the assembled casserole sit at room temperature for 30 minutes before baking, and add 5-10 minutes to the bake time.
  • This recipe is excellent for feeding a crowd; simply use a larger dish and adjust ingredient ratios as needed.

Nutrition

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