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Overnight Croissant Breakfast Casserole

A make-ahead breakfast bake featuring buttery croissants, eggs, cheese, sausage, and ham—perfect for brunch or holidays.
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Prep Time 20 minutes
Cook Time 45 minutes
Total Time 1 hour 5 minutes
Servings: 8 slices
Course: Breakfast, Brunch
Cuisine: American, French
Calories: 420
Ingredients Equipment Method Notes

Ingredients
  

Casserole Base
  • 6 croissants, torn into chunks
  • 6 large eggs
  • 2 cups whole milk
  • 1 cup heavy cream
  • 1 cup cooked breakfast sausage, crumbled
  • 1 cup diced ham
  • 1 cup shredded cheddar cheese
  • 0.5 cup shredded mozzarella cheese
  • 0.25 teaspoon salt
  • 0.25 teaspoon black pepper
  • 1 tablespoon Dijon mustard optional
  • 1 tablespoon fresh parsley, chopped for garnish

Equipment

  • Mixing bowls
  • Whisk
  • 9x13 casserole dish
  • Oven

Method
 

  1. Grease a 9x13-inch baking dish with butter or nonstick spray.
  2. Tear croissants into large chunks and spread evenly in dish.
  3. Top with sausage, ham, and shredded cheeses.
  4. Whisk eggs, milk, cream, mustard, salt, and pepper together.
  5. Pour egg mixture over croissants and press lightly.
  6. Cover and refrigerate overnight (6–8 hours).
  7. Preheat oven to 350°F (175°C). Bake uncovered 40–45 minutes until golden and set.
  8. Let cool 10 minutes, garnish with parsley, and serve.

Notes

Perfect make-ahead breakfast for holidays or gatherings. Use day-old croissants for best texture.