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Overnight Croissant Breakfast Casserole

A buttery, cheesy, make-ahead breakfast bake with flaky croissants, sausage, ham, and eggs – perfect for busy mornings or holiday brunch.
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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
Calories: 410
Ingredients Equipment Method Notes

Ingredients
  

Casserole
  • 6 large croissants day-old, torn into chunks
  • 1 cup cooked breakfast sausage crumbled
  • 0.5 cup diced ham
  • 1 cup shredded cheddar cheese
  • 0.5 cup shredded mozzarella cheese
  • 6 large eggs
  • 1.5 cups whole milk
  • 0.5 cup heavy cream
  • 0.5 tsp salt
  • 0.25 tsp black pepper
  • 0.25 tsp garlic powder optional
  • 2 tbsp chopped parsley plus extra for garnish

Equipment

  • Mixing bowls
  • Whisk
  • 9×13 inch baking dish
  • Skillet

Method
 

  1. Lightly grease a 9x13-inch baking dish.
  2. Layer half the croissant pieces, sausage, ham, and cheeses in the dish.
  3. Repeat with remaining ingredients.
  4. In a large bowl, whisk together eggs, milk, cream, salt, pepper, and garlic powder.
  5. Pour egg mixture evenly over croissants, pressing gently to soak.
  6. Cover and refrigerate overnight (or at least 6 hours).
  7. Preheat oven to 350°F (175°C). Bake uncovered 40–45 minutes until golden and set.
  8. Cool 10 minutes, garnish with parsley, and serve warm.

Notes

You can prepare and bake the same day if needed—just let it rest at least 30 minutes before baking.