I make this every week for breakfast! I lovvvve this!! In a non-stick 8x8 pan you take 2 small cartons of egg whites (you can certainly use whole eggs if you want!) and mix it with as many mushrooms as you like! I add a little sea salt (you can also add a pinch of garlic powder too) and shredded mozzarella cheese and mix well. Then I top it with a little more mozzarella cheese and bake it at 350 degrees for 30 minutes or until it's firm and lightly browned on top.
Once it cools, I cut it into wedges and put it into containers so my breakfast is ready to go for my busy work week! You can add anything you like to this - spinach, red bell peppers and onion (saute' first), feta - you name it!