Heat oven to 450. Place pie shell in 9" pie pan, bake for 5 mins. Remove from oven and let cool. Reduce oven temp to 325. Cut candy bars in 1/2 lengthwise, then cut into 1/4" pieces.
Place candy pieces on the bottom of pie crust. In lg bowl, beat cream cheese and sugar until smooth. Add eggs, beat well. Beat in sour cream and peanut butter until smooth. Pour mix over candy pieces.
Bake 40 mins or until set. Let cool. Heat light cream in small saucepan over low heat. After heated, remove from heat and stir in chocolate chips. Stir until chocolate is melted and mix is smooth. Spread over top o fpie. Chill 2 hrs.