Croissant Breakfast Casserole (Edit recipe)

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Flaky croissants meet a savory twist in this Croissant Breakfast Casserole — ideal for holiday mornings or a cozy weekend brunch. Layers of buttery croissants are baked with caramelized onions, mushrooms, and spinach, all tucked into a creamy egg custard and finished with gooey Gruyere cheese.

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Original Recipe

PREP TIME

15 minutes

COOK TIME

1 hour

INGREDIENTS

11

Serves: 8

Ingredients

6 Croissant, (cut or torn into pieces)
2 Tbsp Olive Oil, (divided)
1 Yellow Onion, sliced
1 pint Baby Bella Mushrooms, sliced
5 oz Baby Spinach
10 Eggs
.5 cup Whole Milk
.5 cup Heavy Whipping Cream
1 tsp Salt
.5 tsp Black Pepper
4 oz Gruyere Cheese, (shredded)

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Process

Cook Mode

Note, these instructions are written assuming the standard serving size, since you have modified the number of servings, these steps may need to be modified for best results

Preheat oven to 350 degrees F.
Heat 1 tablespoon olive oil in a large skillet over medium heat. Add onions and cook, stirring occasionally, until softened and just beginning to caramelize, about 15 minutes.
Transfer onions to a plate. Add remaining 1 tablespoon olive oil to the skillet, then add mushrooms. Cook until browned and starting to crisp, about 8 minutes. Stir in spinach, a handful at a time, until wilted. Remove from heat.
In a large bowl, whisk together eggs, milk, heavy cream, salt and pepper.
Grease a 9-inch by 13-inch baking dish with cooking spray or butter. Layer in half of the croissant pieces. Top with onions, mushrooms and spinach, then sprinkle with half of the cheese.
Add remaining croissant pieces. Pour egg mixture evenly over the top and sprinkle with remaining cheese.
Cover with foil and bake for 30 minutes. Remove foil and bake for another 10 minutes, or until the top is golden and slightly crisp.
Let rest for 5 minutes before slicing and serving.

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About This Recipe

Show nutritional information

This is our estimate based on online research.
Calories:	158
Fat:	14 g
Carbohydrates:	3 g
Protein:	8 g
Cholesterol:	37 g
Sodium:	339 mg
Fiber:	1 g
Sugars:	1 g
Sugar Alcohol:	0 g
Calculated per serving.