Peanut Butter Cake
["1 box Duncan Hines yellow cake mix", "1/2 c. creamy or chunky peanut butter", "1 box confectioners sugar", "6 Tbsp. milk", "1/2 stick margarine"]
["Make cake according to box directions.", "Make stack or sheet cake.", "Cool completely.", "Mix all other ingredients in a medium saucepan; heat over medium heat until of smooth spreading consistency.", "Spread on cool cake and enjoy."]
["chunky peanut butter", "confectioners sugar", "milk", "margarine"]