In a saucepan over low heat or in a microwave-safe bowl, melt candy bars and 1/2 cup butter; stir until blended. Stir in cereal. Pat into a greased 11 x 7 x 2 in pan.
In another saucepan or microwave-safe bowl, melt the chocolate chips and remaining butter; stir until smooth. Spread over cereal mixture. Refigerate until firm.
Yield: 2 - 2 1/2 doz