In a medium bowl, combine the crushed Oreo cookies and melted butter. Press the mixture evenly into the bottom and up the sides of a 9-inch pie plate.
In a large bowl, beat the softened cream cheese and powdered sugar until smooth.
In a separate bowl, whip the cold heavy cream with the vanilla extract until stiff peaks form. Gently fold the whipped cream into the cream cheese mixture.
Fold in the chopped Oreo cookies.
Spoon the filling into the prepared crust and spread evenly.
Refrigerate for at least 2 hours, or until firm. Garnish with whipped cream and Oreo crumbs if desired before serving.
Notes
This pie is best served chilled. For an even firmer pie, you can add 1-2 tablespoons of milk to the cream cheese mixture if it seems too stiff.