In A Small Bowl, Beat The Egg And Egg Whites. Add Cheeses, Salt, Pepper Flakes, Garlic Powder And Pepper; Mix Well. Set Aside. In An 8-In. Nonstick Skillet, Saute The Mushrooms, Green Pepper And Onion In Oil For 4-5 Minutes Or Until Tender. Add Spinach; Cook And Stir Until Spinach Is Wilted. Add Egg Mixture. As Eggs Set, Lift Edges, Letting Uncooked Portion Flow Underneath. Cut Into Wedges. Serve Immediately.