Preheat oven to broil. Place bacon in a large, deep skillet. Cook over medium-high heat until evenly brown. Drain, crumble and set aside. In a medium bowl, combine the bacon, cheese, mustard, and mayonnaise. Stir well. Arrange party bread on a cookie sheet. Spoon mixture onto each slice of bread. Broil for 5 minutes, or until bubbly.

Makes 30 slices.