Asparagus, Mushroom & Swiss Omelet

In a medium skillet, melt butter over medium heat. Saute fresh sliced asparagus along with fresh sliced mushrooms until tender. Set aside. In a small bowl, whip egg whites with seasoning. In same pan, still over medium heat, spray pan with non-stick cooking spray. Add egg mixture. Once eggs begin to set, add sauteed veggies & shredded cheese. Once cheese is lightly melted, it's ready to serve.