hamburger buns
chopped ham
cheese
egg whites (beaten stiff)
1/3 c. mayonnaise
1 tsp. prepared mustard

Cut hamburger buns in half. Spread with chopped ham and 1 slice of cheese. Beat 1 egg white very stiff, add mayonnaise and mustard. Spread this mixture atop prepared buns and bake at 450 degrees for 4 minutes or until puffed up and brown.