1 can condensed milk
Chocolate sheet cake
1/2 c. peanut butter

Bake sheet cake according to directions. After cake has been removed from oven, pour sweetened condensed milk into a small heavy saucepan. Cook over medium-low heat; this must be stirred constantly. When frosting begins to bubble and thicken remove from heat immediately. Stir in peanut butter and pour over warm sheet cake.