Mushroom and Gruyère Croissant Breakfast Casserole
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Level:Easy
Total: 5 hr 30 min(includes chilling time)
Active: 40 min
Yield:6 to 8 servings
Nutritional Analysis
Per Serving
Serving Size
1 of 8 servings
Calories
527
Total Fat
38 g
Saturated Fat
20 g
Carbohydrates
26 g
Dietary Fiber
4 g
Sugar
8 g
Protein
22 g
Cholesterol
328 mg
Sodium
611 mg
This vegetarian breakfast casserole is easy to assemble up to a day ahead and bake off in the morning, making it the perfect addition to your brunch menu. Meaty mushrooms stand in for the typical breakfast proteins and dish is rounded out with a generous amount of creamy Gruyère, plus fresh thyme and tangy Dijon mustard. We use buttery, flaky croissants as the perfect vessel to sandwich the cheesy mushroom filling and soak up all the custardy eggs.
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Directions
Melt the butter in a large skillet over medium heat. Add the mushrooms, garlic, shallots, thyme, 1 teaspoon salt and several grinds of black pepper. Cook, stirring frequently, until the mushrooms are tender and browned in spots, about 5 minutes. Stir in the sherry vinegar and scrape up any brown bits from the bottom of the skillet. Transfer to a large bowl to cool slightly, 5 minutes.
Stir the cream cheese, 1 cup of the Gruyère and half of the sliced scallions into the mushroom mixture.
Whisk together the eggs, half-and-half, 1 tablespoon of the Dijon, remaining scallions, 3/4 teaspoon salt and several grinds of black pepper in another large bowl until very smooth; set aside.
Lightly grease a 9-by-13-inch baking dish with butter. Cut the croissants in half lengthwise. Spread 1/2 teaspoon of Dijon on the inside of each croissant, top and bottom. Arrange the bottom halves of the croissants in the prepared baking dish. Divide the mushroom mixture between the croissant bottoms and then sandwich with the top halves; the croissants will be filled generously and it’s ok if a few of the mushrooms spill over into the baking dish.
Pour the egg mixture over and around the croissants. Sprinkle the top of the croissants with the remaining 1 cup Gruyère. Cover and refrigerate for at least 4 hours or preferably overnight.
When ready to bake, preheat the oven to 350 degrees F.
Cover the baking dish with foil and bake until the egg has puffed and nearly set, about 30 minutes. Uncover and bake until the eggs are completely set and the croissants are golden, about 15 minutes more. Let sit for 5 minutes before serving.
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