Press pie crust into 9-inch tart pan or quiche pan and poke holes around the crust with a fork. Bake in preheated oven for 7 minutes. Remove and cool.
1 pie crust
While the crust is baking, heat olive oil in pan over medium heat. Add shallots and cook until softened, about 2 minutes. Add mushrooms and cook for 5-7 minutes. Add spinach and cook until wilted. Remove from heat and set aside.
In a large bowl whisk together eggs and cream. Season to taste with salt and pepper.
3 eggs, 1½ cups whipping cream
Sprinkle Gruyere cheese on bottom of cooled crust and spread mushroom, shallot and spinach mixture on top. Pour egg and cream mixture over top and sprinkle with parmesan cheese. Bake for 35-38 minutes or until quiche is set and lightly browned.
1 cup shredded gruyere cheese, ⅓ cup grated parmesan cheese
Remove from oven, cool for 10 minutes, cut and serve.
Notes
Pie Crust: We used a premade pie crust for the sake of convenience, feel free to make your favorite pie crust recipe instead. Pre baking the crust ensures you don't have a soggy bottom to the quiche.Heavy Cream: Heavy whipping cream gives this quiche its fluffy, rich texture. You can substitute half and half if desired, but you will lose some of the puff.Spinach: If you don't have any fresh spinach on hand, you can use a package of frozen spinach. Be sure to thaw it and squeeze all of the liquid out of it before adding to quiche.Cheese: Gruyere cheese is a great melting cheese that will give you a smooth and silky filling.Be sure to let the quiche sit for 10 minutes before slicing and serving. This helps it keep its shape. Make-ahead Tips
Cool the quiche completely after baking and wrap it in plastic wrap. It will keep in the refrigerator for 3 days or the freezer for 3 months.
If you are freezing it, wrap it in foil over the plastic wrap to prevent freezer burn. When you are ready to serve it, unwrap the quiche, place it on a baking sheet and bake at 350 for 30 minutes or until it is heated through.
If heating from the refrigerator, place on baking sheet and bake at 350 for 20 minutes or until heated through.