01 -
Preheat oven to 425°F (220°C). Prepare a 9-10 inch leak-proof springform pan by spraying well with cooking oil, then lining with parchment paper (cut out a circle for bottom and strips for sides). Spray again. Alternatively, use a 9 or 10-inch deep dish pie plate.
02 -
Thaw and squeeze excess moisture from hash browns using paper towels. In a large bowl, combine hash browns, beaten egg, melted cooled butter, onion powder, garlic powder, salt, and pepper. Mix thoroughly.
03 -
Press mixture evenly into the springform pan, covering the bottom and extending up the sides. For a crisper crust, lightly spray with cooking oil. Use the bottom of a glass or measuring cup to ensure an even layer. Par-bake for 20-30 minutes until golden and crispy. Remove from oven and set aside.
04 -
In a large frying pan, sauté the leeks and red peppers in butter for about 10 minutes. Add mushrooms and continue cooking for 2-3 minutes more. Push vegetables to one side of the pan, add chopped prosciutto and quickly crisp. Remove from heat and allow to cool slightly.
05 -
In a large mixing bowl, whisk together eggs, cream, salt, and pepper until creamy. Fold in the sautéed vegetables, artichoke hearts, grated Gruyere cheese, and prosciutto. The mixture will be quite thick.
06 -
Place the crust on a parchment-lined baking sheet to catch any potential leaks. Pour the egg mixture into the pre-baked crust. Place in the preheated 425°F (220°C) oven and immediately REDUCE HEAT to 400°F (205°C). Bake uncovered for 45 minutes, then cover loosely with foil and continue baking for 10-20 minutes more until golden brown with minimal jiggle in the center. A skewer inserted in the center should come out clean.
07 -
Allow quiche to cool for 5-10 minutes before removing from the springform pan, slicing, and serving.