1. Preheat oven to 350°F. Grind bars in food processor until they resemble crumbs.
2. Mix with peanut butter and press into 9" pie tin. (Optional: make mini pies and divide filling amongst muffin tin!)
3. Bake for 5 minutes, or until set. Let cool completely.
4. Mix together filling ingredients, except whipped topping, until fully incorporated.
5. Fold in whipped topping and pour into crust.
6. Chill at least 1 hour, overnight for best results.