Put pie crust in freezer while you do these steps.
Whip peanut butter and cream cheese until smooth.
Add sugar and vanilla and beat until blended. Add sugar slowly so you don't end up in a cloud of sugar!
Fold in ½ the container of Cool Whip.
Pour this mixture into pie crust.
Spread or pipe the rest of the Cool Whip on top. If possible, place lid back onto pie.
Freeze until set. Thaw for a couple minutes, cut, and enjoy!