Process the oreos in a food processor or blender until fine crumbs remain. In a large bowl, combine the crushed oreos with the melted butter. Press this mixture evenly into a 9 or 10 inch pie pan. Use the bottom of a measuring cup to pack the crust down. Place the crust in the fridge to chill until ready to fill.

In a large mixing bowl, combine the cream cheese, powdered sugar and peanut butter with an electric mixer until well blended. Add the cool whip and mix on low until combined. Spread this mixture over the crust. Cover the pie pan with plastic wrap and refrigerate for 4-8 hours.

Before serving the pie - place a metal or glass mixing bowl and beaters in the freezer for 15 minutes.

Remove the bowl from the freezer. Add the heavy cream, powdered sugar and vanilla extract and beat with an electric mixer for 4-5 minutes, or until stiff peaks form / it’s scoop-able with a spoon and holds its shape.

Spoon onto the pie and top with chopped reese's cups.