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Ham & Cheese Croissant Casserole

This cozy ham and cheese croissant casserole is a rich, buttery breakfast bake with a custardy center and golden top. Perfect for make-ahead brunches or holiday mornings, it delivers bistro-style comfort with minimal effort.
Print Recipe
Prep Time 15 minutes
Cook Time 55 minutes
Chill Time 8 hours
Total Time 1 hour 10 minutes
Servings: 6 servings
Course: Breakfast, Brunch, Casserole, Comfort Food, Holiday
Cuisine: American, French-Inspired
Calories: 410
Ingredients Method Notes

Ingredients
  

  • cooking spray butter-flavored
  • 2 croissants cut into cubes
  • 1/2 cup Swiss Gruyère cheese shredded
  • 1 cup ham diced, cooked
  • 6 eggs large
  • 3/4 cup milk whole or oat milk
  • 1/2 cup sour cream or Greek yogurt
  • 1/4 tsp sea salt
  • 1/4 tsp black pepper
  • 1 tbsp Dijon mustard
  • 2 tbsp green onions optional, chopped
  • 1/2 cup cherry tomatoes halved or fruit alternative

Method
 

  1. Preheat oven to 350°F and grease an 8x8-inch baking dish.
  2. Spread croissant cubes in dish and top with cheese and ham.
  3. Whisk eggs, milk, sour cream, mustard, salt, and pepper.
  4. Pour mixture over croissants and press gently to soak.
  5. Add tomatoes or fruit and refrigerate overnight.
  6. Bring to room temperature briefly, then bake 45–55 minutes until set.
  7. Cool slightly, garnish with green onions, and serve.

Notes

Letting the casserole rest before baking ensures even cooking. Customize with fruit or vegetables for variation.