Veggie Egg White Omelet

Name: Veggie Egg White Omelet
Ingredients: 3 egg whites; 1 cup spinach; 2 tbsp green bell pepper (diced small); 2 tbsp broccoli (chopped small); 1/4 cup parmesan cheese (grated); 1/2 tbsp butter; pepper (to taste); salt (a big pinch)