Preheat Oven to 400 degrees
In a skillet lightly sauté Spinach, olive oil and Mushrooms over low heat until spinach is wilted. Allow to cool.
In a mixing bowl add eggs with salt, pepper, red pepper flakes and Half & Half. Whisk gently for 1-2 minutes, until the mixture is a solid light yellow color.
Put the cooled spinach and mushroom into pie shell and top with Parmesan and Feta Cheese.
Pour egg mixture over the top.
Bake at 400 degrees for 45- 50 minutes.
Allow to cool 10 -15 minutes before cutting.