heat oven to 450°. Place pie crust in a 9 inch glass pie plate as directed on box for one crust filled pie. Bake 5 to 7 minutes or until very light Golden Brown. Cool while preparing filling. Reduce oven temperature to 325°.
Place candy bar pieces over bottom of partially baked crusts. In small bowl, beat cream cheese and sugar with mixer on medium speed until smooth. Beat in one egg and a time until well blended. Add sour cream and peanut butter, beating until mixture is smooth. Pour over candy bar pieces. Bake at 325° for 30 to 40 minutes or until center is set. Cool completely on cooling rack, about two hours.
In a 1 quart pan, heat whipping cream until very warm. Remove from heat. Stir in chocolate chips until melted and smooth. Spread over top of pie. Refrigerate 2 to 3 hours or until set before serving. Garnish with candy pieces. If desired. Cover and refrigerate any remaining pie. Serves 10.