Pulse Oreos in a food processor until crushed into fine crumbs. Add melted butter and stir to combine. Press mixture into a 10-inch pie plate to form crust. Freeze while preparing filling.
In a mixing bowl, combine peanut butter, sugar, cream cheese, and whipped topping until smooth and fluffy. Pour the filling into the prepared crust and smooth the top.
Freeze the pie for 3 to 4 hours or until firm. Slice and serve chilled.
Notes
This peanut butter pie is best served chilled and can be stored in the freezer for up to one month. Let slices thaw slightly before eating for best texture.