For the pie filling- Take a medium sized bowl and beat the cream cheese and the peanut butter until it is well blended and smooth. - Add the powdered sugar and beat until well blended. Gently fold in 1 ½ cups of whipped topping until combined.Pour the mix into the crust and spread evenly. - Spread the leftover whipped topping over the top and sprinkle with peanut butter crumbs. - Freeze for about 2 hours or overnightFor peanut butter topping (optional)Take a small bowl and using a fork cut the peanut butter into powdered sugar until the crumbs are formed.