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Overnight Croissant Breakfast Casserole

  • Author: EMMA
  • Prep Time: 20 minutes
  • Cook Time: 40 minutes
  • Total Time: 1 hour (plus overnight chill)
  • Yield: 6 to 8 servings 1x
  • Category: Breakfast
  • Method: Baking
  • Cuisine: American

Description

Golden, buttery croissants soaked in a savory custard, crowned with cheese, sausage, and sweet bell peppers this overnight croissant breakfast casserole is the kind of dish that welcomes you to the table like a warm hug. It’s make-ahead magic, perfect for slow Sunday mornings, holiday brunches, or any time you want breakfast to feel a little extra special.


Ingredients

Units Scale
  • 6 croissants, torn into large pieces
  • 8 large eggs
  • 2 cups whole milk
  • 2 cups shredded cheddar cheese
  • 1 pound cooked breakfast sausage
  • 1 cup diced bell pepper
  • 1 cup diced onion
  • 1 tsp garlic powder
  • Salt, black pepper, paprika to taste
  • 1/4 cup fresh parsley, chopped

Instructions

  1. Preheat oven to 350°F (175°C) and grease a 9x13-inch baking dish with butter or spray.
  2. In a large mixing bowl, whisk eggs, milk, garlic powder, salt, pepper, and paprika until light and frothy.
  3. Gently fold in torn croissant pieces, sausage, diced bell pepper, and onion.
  4. Pour everything into your greased dish. Top with shredded cheddar.
  5. Cover tightly with plastic wrap and refrigerate overnight (or at least 4 hours).
  6. Let sit at room temperature for 15 minutes before baking.
  7. Bake uncovered for 35–40 minutes, until golden brown and the center is set.
  8. Cool for 5 minutes, then sprinkle with chopped parsley. Serve warm and watch it disappear.


Notes

Use stale croissants for better texture. Store leftovers covered in the fridge for up to 4 days or freeze for up to 2 months. Reheat in the oven at 325°F or in the microwave in 30-second bursts. For a vegetarian version, use tofu or plant-based sausage. Gluten-free and dairy-free options available using appropriate substitutes.


Nutrition

  • Serving Size: 1 slice
  • Calories: 390
  • Sugar: 3g
  • Sodium: 620mg
  • Fat: 28g
  • Saturated Fat: 12g
  • Unsaturated Fat: 14g
  • Trans Fat: 0g
  • Carbohydrates: 20g
  • Fiber: 1g
  • Protein: 17g
  • Cholesterol: 195mg