Irresistible Overnight Croissant Breakfast Casserole Recipe
This Irresistible Overnight Croissant Breakfast Casserole combines flaky croissants with savory sausage, melted cheddar cheese, and a rich egg custard for a convenient make-ahead breakfast. Simply prepare the layers the night before, refrigerate overnight, and bake in the morning for a warm, comforting dish that’s perfect for family gatherings or a leisurely weekend brunch.
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Total Time: 6 hours 60 minutes (including refrigeration)
- Yield: 8 servings 1x
- Category: Breakfast Casserole
- Method: Baking
- Cuisine: American
Ingredients
Scale
Main Ingredients
- 5 large croissants (preferably day-old), torn into large chunks
- 1 lb (450g) ground sausage, cooked and drained
- 1 cup (120g) shredded cheddar cheese
- 6 large eggs
- 2 cups (475ml) whole milk
- 1 teaspoon salt
- ½ teaspoon black pepper
- ½ teaspoon garlic powder
- ½ teaspoon onion powder
- Fresh parsley, chopped (optional, for garnish)
Optional Add-Ins & Swaps
- Cooked turkey, chicken, or plant-based sausage
- Swiss, Monterey Jack, or mozzarella cheese
- Sautéed spinach, mushrooms, or bell peppers
- Dash of hot sauce or red pepper flakes, for a spicy kick
Instructions
- Prepare the Base: Grease a 9×13-inch baking dish with cooking spray or butter. Layer torn croissants evenly in the dish. Sprinkle cooked sausage and shredded cheese evenly over the croissants.
- Make the Egg Mixture: In a large bowl, whisk together eggs, whole milk, salt, black pepper, garlic powder, and onion powder until fully combined. Pour this custard mixture evenly over the croissant, sausage, and cheese layers. Gently press down with a spatula to help the croissants absorb the liquid.
- Refrigerate Overnight: Cover the baking dish tightly with foil and refrigerate for at least 6 hours or overnight to allow the croissants to soak up the custard mixture.
- Bake in the Morning: Preheat your oven to 350°F (175°C). Remove the foil and bake the casserole for 40 to 45 minutes, or until the top is golden brown and the center is fully set. Remove from oven and let it cool for 10 minutes before garnishing with fresh chopped parsley. Serve warm and enjoy!
Notes
- Day-old croissants work best as they absorb the custard without becoming too soggy.
- You can customize the casserole by swapping sausage for cooked turkey, chicken, or plant-based alternatives.
- Feel free to add sautéed vegetables like spinach, mushrooms, or bell peppers for extra flavor and nutrients.
- The casserole can be assembled up to 24 hours in advance for convenience.
- Leftovers can be stored in an airtight container in the refrigerator for up to 3 days and reheated gently in the oven or microwave.
Keywords: overnight casserole, breakfast casserole, croissant casserole, sausage breakfast bake, make-ahead breakfast, brunch recipe, cheesy casserole
