Fudge Topped Peanut Butter Pie

1 premade graham cracker pie crust
1 pkg (4 serving size) vanilla instant pudding and pie filling mix
1 container (8oz) sour cream
3/4 c milk
1 pkg Reese's peanut butter chips, divided
2 Tbps vegetable oil
1 jar (12 oz) chocolate fudge topping

Whisk together pudding mix, sour cream and milk in medium bowl, set aside

Place 1 1/2 c peanut butter chips and oil in bowl.  Microwave on high 45 seconds or until smooth. Using hand mixer, gradually add to pudding mixture, spread evenly into crust.

Spread chocolate fudge topping over pie, cover and refrigerate 3 hours.  Prior to serving, top with remaining peanut butter chips.