Oreo Crust: Place Oreo cookies in a food processor and pulse until small crumbs. Stir in the melted butter. Press the mixture into a deep dish* 9.5-inch pie plate, pressing firmly into the bottom and up the sides of the dish. Refrigerate crust for 1 hour (or freeze for 20-30 minutes) before adding filling.

Peanut Butter Pie Filling: In a mixing bowl beat together the cream cheese and peanut butter until smooth. Add powdered sugar and vanilla and mix well, until smooth. Add heavy cream to a separate mixing bowl and beat with mixers until stiff peaks. Fold in the whipped cream to the peanut butter mixture until combined.

Chill: Pour filling into cooled pie shell and cover gently with plastic wrap. Refrigerate for at least 4 hours, or overnight, before serving.

Serve: If desired, serve with additional whipped cream on top, sprinkled with crushed candy or candy bars.