Exceedingly Awesome Omelette

I made up a recipe for an omelette yesterday that I thought I would share.
Ingredients:
Egg whites
1/4 c. yellow sweet onion- diced
4-8oz mushrooms
2 cups spinach leaves
Italian Cheese blend
Thyme
Garlic Salt
1 tablespoon Butter

In a large frying pan, sautee onion in butter for about 2 minutes. Add mushrooms and sautee until the onions and mushrooms are brown on both sides. Add spinach leaves and sautee for another minute. Place mixture to side. Add desired amount of egg whites (I use the "egg beaters" brand egg whites) and Italian cheese blend. Once the egg whites are almost completely cooked, place the mixture back on top and add a sprinkle of thyme and garlic salt. Presto! You have an awesome omelette right before your eyes!