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