Chop mushrooms, onions and a steak.
In a large, preheated skillet add mushrooms and let them brown. Once the mushrooms browned, add onions and cook until lightly browned and softened.
Add salt and pepper to taste.
Add spinach, if you are using it, and stir until it wilts.
Throw the steak in and stir quickly. Turn off the heat quickly. There is no need to cook the steak, just reheating it slightly will do the trick.
Scramble 2 whole eggs with 3 ounces of liquid egg whites in a small bowl. Season with salt and pepper.
Preheat another non stick pan and add the scrambled eggs. Keep on lifting the edges of the eggs so as much liquid as possible touches the hot surface.
Once the omlette is almost set, add a slice (or 2 of cheese).
Add 1/3 of the philly cheesesteak filling and fold it.
