In a large bowl, combine the cheese, ham, mayonnaise, bacon and mustard. Split biscuits into thirds. Press onto the bottom and up the sides of ungreased miniature muffin cups. Fill each with about 1 tablespoon of cheese mixture.
Bake at 450° for 9-11 minutes or until golden brown and the cheese is melted. Let stand for 2 minutes before removing from the pans. Serve warm. Yield: 2-1/2 dozen.