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Irresistible Savory Croissant Casserole

A decadent and comforting savory casserole made with buttery croissants, a rich egg custard, and a blend of three cheeses.
Print Recipe
Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour 10 minutes
Servings: 8 servings
Course: Breakfast, Brunch
Cuisine: French Inspired
Calories: 420
Ingredients Equipment Method Notes

Ingredients
  

Base Ingredients
  • 6 large croissants day-old, torn into chunks
  • 1 cup whole milk
  • 1/2 cup heavy cream
  • 8 large eggs
  • 1 teaspoon Dijon mustard
  • 1/2 teaspoon garlic powder
  • 1/2 teaspoon onion powder
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 2 cups shredded sharp cheddar cheese
  • 1 cup shredded Gruyère cheese
  • 1/2 cup grated Parmesan cheese
  • 2 tablespoons unsalted butter melted
  • Fresh chives chopped, for garnish

Equipment

  • 9x13-inch baking dish
  • Large mixing bowl
  • Whisk
  • Spatula

Method
 

Assembly and Baking
  1. Preheat your oven to 350°F (175°C) and grease a 9x13-inch baking dish.
  2. Place the torn croissant chunks into the prepared baking dish.
  3. Whisk together milk, cream, eggs, mustard, garlic powder, onion powder, salt, and pepper in a large bowl until smooth.
  4. Distribute the shredded cheddar and Gruyère evenly over the croissant chunks.
  5. Pour the egg mixture over the croissants and cheese, pressing down lightly with a spatula to ensure absorption.
  6. Sprinkle the Parmesan cheese on top and drizzle with the melted butter.
  7. Let the casserole sit at room temperature for 10 minutes.
  8. Bake for 35-40 minutes until the top is golden brown and a knife inserted in the center comes out clean.
  9. Remove from the oven, let rest for 5 minutes, garnish with chives, and serve warm.

Notes

Use day-old croissants for the best texture. Store leftovers in the fridge for up to 4 days or freeze for up to 3 months.