01 - Preheat oven to 350°F. Crush Oreo cookies in a food processor until fine crumbs form. Mix with melted butter until well combined. Press the mixture firmly into the bottom and up the sides of a 9-inch pie dish. Bake for 10 minutes, then allow to cool completely.
02 - In a large mixing bowl, beat peanut butter and cream cheese together until smooth and creamy. Add powdered sugar and continue beating until fully incorporated. In a separate bowl, whip the heavy cream until stiff peaks form. Gently fold the whipped cream into the peanut butter mixture until completely blended and smooth.
03 - Spread the peanut butter filling evenly over the cooled Oreo crust, smoothing the top with a spatula. Refrigerate for at least 2 hours or until the filling is fully set and firm.
04 - Whip the remaining heavy whipping cream with powdered sugar until stiff peaks form. Spread or pipe the whipped cream over the chilled pie surface. Garnish generously with coarsely crushed Oreo cookies.
05 - Slice the pie while cold and serve immediately. Store any leftovers covered in the refrigerator to maintain freshness and texture.