Drain and return to saucepan. Stir in evaporated milk, cheese and mustard. Stir over medium-high heat until cheese melts and sauce just boils. Add salt and pepper to taste. This easy treat makes a perfect addition to a child's lunchbox.
Kids can help make the bars by stirring in the peanut butter chips or spreading the jelly.
Stir in beaten egg until blended. Sprinkle 1 cup peanut butter chips over jelly. Bake in oven 25 to 30 minutes, or until lightly browned. Cool completely in pan on wire rack. Cut into bars.