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Croissant Breakfast Casserole

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Croissant Breakfast Casserole is a rich, savory dish made with buttery croissants, eggs, cheese, and optional meats or vegetables. It’s perfect for brunch, holidays, or meal prepping, with a soft, custard-like center and golden, flaky top.

Ingredients

  • 6 large croissants (preferably day-old), torn into bite-sized pieces
  • 8 large eggs
  • 2 cups whole milk or half-and-half
  • 2 cups shredded cheese (cheddar, mozzarella, or a mix)
  • 1/2 cup diced onion (optional)
  • 1 cup diced bell pepper or spinach (optional)
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/2 teaspoon garlic powder
  • Optional toppings: chopped parsley, sliced green onions, or hot sauce

Instructions

  1. Preheat oven to 350°F (175°C) and grease a 9×13-inch baking dish.
  2. Tear croissants into bite-sized pieces and layer evenly in the prepared dish.
  3. If using, sauté diced onions and bell peppers until softened; set aside.
  4. In a large bowl, whisk together eggs, milk, salt, pepper, and garlic powder until fully combined.
  5. Scatter cooked veggies and/or meats evenly over the croissant pieces.
  6. Pour egg mixture evenly over the entire dish, pressing croissants gently to soak.
  7. Top with shredded cheese, distributing evenly.
  8. Let sit for 15–30 minutes to absorb (or cover and refrigerate overnight).
  9. Bake uncovered for 35–45 minutes, or until the center is set and the top is golden and bubbling.
  10. Let cool for 5–10 minutes before slicing and serving. Top with optional parsley or hot sauce if desired.

Notes

Use slightly stale croissants for better texture.Chilling overnight enhances flavor and helps croissants absorb liquid.Mix and match cheeses to suit your preference.Customize with  extra vegetables.Let the casserole rest before slicing to keep it from falling apart.

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