Preheat oven to 350°F (175°C). Crush Oreo cookies into fine crumbs and mix with melted butter. Press mixture into a pie dish and bake for 10 minutes. Let cool completely.
For ganache, heat heavy cream until boiling and pour over chopped chocolate. Stir until smooth and cool to room temperature.
Whip cold heavy cream until stiff peaks form. In a separate bowl, blend cream cheese, peanut butter, sugar, and vanilla. Gently fold in whipped cream.
Spread peanut butter mixture over cooled crust, then pour ganache on top. Refrigerate for at least 6 hours or overnight.
Before serving, decorate with whipped cream, crushed Reese’s Pieces, or chopped peanuts as desired.
Notes
Feel free to customize the toppings with your favorites. This pie is best served chilled.