Mia's Veggie Omelet

Cut tough stems off asparagus. Chop the tender portions of the spears into small pieces. Microwave in microwave-safe bowl with water until soft, about 2 minutes. Heat oil in frying pan. Add vegetables and sauté over medium-high heat until cooked (onion is transparent). Whisk egg whites together until a froth forms. Add in egg whites and fry until omelet has reached desired consistency. Top with shredded cheese, cover, and continue heating until cheese has just melted. Season to taste with salt and pepper if desired and serve warm.