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Buttery Breakfast Casserole

Irresistible Buttery Breakfast Casserole for Lazy Mornings

This Buttery Breakfast Casserole combines flaky croissants, savory sausage, and melted Gruyère cheese for a perfect brunch dish.
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Prep Time 20 minutes
Cook Time 45 minutes
Refrigeration Time 4 hours
Total Time 5 hours 5 minutes
Servings: 8 slices
Course: Breakfast
Cuisine: American
Calories: 300
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Base
  • 6 pieces Croissants Substitute with day-old bread if necessary.
  • 2 tablespoons Extra-Virgin Olive Oil Use melted butter for stronger flavor.
For the Filling
  • 3 tablespoons Scallions Chives can be an alternative.
  • 1 pound Sweet Italian Sausage Opt for turkey sausage for a lighter option.
  • 1 tablespoon Fresh Sage Replace with 1 teaspoon dried sage if needed.
For the Custard
  • 6 large Eggs
  • 2 cups Whole Milk Use half-and-half for lighter option.
  • 1 cup Heavy Cream
For the Cheese
  • 1.5 cups Gruyère Cheese Swiss cheese can be a substitute.
For Seasoning
  • 1 teaspoon Kosher Salt
  • 1 teaspoon Black Pepper

Equipment

  • large skillet
  • mixing bowls
  • Baking dish
  • Baking Sheet

Method
 

Step-by-Step Instructions
  1. Preheat your oven to 500°F (260°C). Toast croissants cut-side up for 5 to 10 minutes until golden brown.
  2. In a large skillet, heat olive oil over medium-high heat. Cook scallions and sausage for about 5 minutes until browned.
  3. In a mixing bowl, combine toasted croissants and sausage mixture, tossing gently.
  4. In another bowl, whisk together eggs, milk, cream, Gruyère cheese, salt, and pepper until smooth.
  5. Lightly oil a 9x13-inch baking dish and layer the croissant mixture. Pour the custard mixture over the top.
  6. Cover the dish with plastic wrap and refrigerate for at least 4 hours or ideally overnight.
  7. Preheat the oven to 350°F (175°C). Scatter remaining Gruyère cheese on top and bake for about 45 minutes.
  8. Allow the casserole to cool for about 10 minutes before serving. Garnish with chopped scallions.

Nutrition

Serving: 1sliceCalories: 300kcalCarbohydrates: 15gProtein: 12gFat: 22gSaturated Fat: 10gPolyunsaturated Fat: 2gMonounsaturated Fat: 8gCholesterol: 180mgSodium: 600mgPotassium: 220mgFiber: 1gSugar: 2gVitamin A: 600IUVitamin C: 2mgCalcium: 200mgIron: 1mg

Notes

For best results, refrigerate overnight and serve garnished with fresh herbs.

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