Preheat oven to 350 Degrees F. Spray a deep-dish pie pan with non-stick spray.
Layer the pan with spinach, peppers, mushrooms, and feta. Pour the entire package of AllWhites 100% Liquid Egg Whites over the vegetables. Top with Mozzarella.
Place in the preheated oven for 45 minutes or until eggs are mostly set and the cheese has browned to a golden-brown color.
Remove from oven and allow to set for about 10 minutes.
Slice and enjoy topped with fresh salsa and a side of fruit.