Line an 8-inch square pan with foil, extending foil over edges. Spray lightly with nonstick cooking spray. Set aside.
Melt chips in medium saucepan over low heat, stirring constantly. Remove from heat. or, microwave chips in medium- size microwave-safe bowl on high for 1 to 2 minutes, or until chips are melted, stirring occasionally.
Reserve 2 tablespoons of the chopped candy bars. Add frosting and remaining candy bars. Blend well.
Spread in sprayed foil-lined pan. Sprinkle with reserved 2 tablespoons of the chopped candy bars. Refrigerate for 1 hour, or until firm.
Remove fudge from pan by lifting foil. Remove foil from fudge. Cut into squares.