Prepare the Crust: In a medium-sized mixing bowl, combine the finely crushed Oreo cookies with the melted unsalted butter. Stir until the crumbs are well-coated with butter, forming a moist mixture. Press this mixture firmly into the bottom and up the sides of a 9-inch pie dish to create an even crust. Once done, place the crust in the refrigerator to chill and set while you prepare the filling.
Make the Filling: In a large mixing bowl, use an electric mixer to beat the creamy peanut butter and softened cream cheese together until the mixture is smooth and well-combined. Gradually sift in the powdered sugar, mixing continuously until everything is blended and there are no lumps.
Fold in Whipped Cream: Gently incorporate the whipped cream into the peanut butter mixture using a spatula or large spoon. Carefully fold until the filling is light and fluffy, being cautious not to over-mix so that the whipped cream retains its airy texture.
Assemble the Pie: Take the chilled Oreo crust from the refrigerator. Spoon the creamy peanut butter filling into the prepared crust and spread it evenly using a spatula. Make sure the filling is evenly distributed and smooth on top.
Chill: Cover the assembled pie with plastic wrap or aluminum foil. Refrigerate for at least 4 hours (or ideally overnight) to ensure the pie sets completely and the flavors meld together beautifully.
Serve: When ready to serve, remove the pie from the refrigerator. For an added touch, sprinkle the top with chocolate chips and extra crushed Oreos for garnish. Slice into wedges and enjoy this delightful dessert!