01 - Preheat oven to 350°F. Place Oreo cookies in a food processor and pulse until fine crumbs form. Transfer crumbs to a mixing bowl, add melted butter, and stir until evenly combined. Press the mixture firmly into the bottom and up the sides of a 9-inch pie dish. Bake for 10 minutes, then remove from oven and let cool completely before filling.
02 - In a large mixing bowl, combine creamy peanut butter and softened cream cheese. Beat with an electric mixer on medium speed until completely smooth and well blended, about 2 minutes. Add powdered sugar and continue beating until fully incorporated. In a separate bowl, whip 1 cup heavy cream until stiff peaks form. Gently fold the whipped cream into the peanut butter mixture using a rubber spatula until no white streaks remain.
03 - Spread the peanut butter filling evenly over the cooled Oreo crust, smoothing the top with a spatula. Cover the pie dish with plastic wrap and refrigerate for at least 2 hours or until the filling is completely set and firm to the touch.
04 - In a clean bowl, whip the remaining 1 cup heavy cream with 2 tablespoons powdered sugar until stiff peaks form. Spread the whipped cream over the chilled peanut butter filling, or pipe it decoratively using a star tip. Sprinkle crushed Oreo cookies generously over the top for garnish.
05 - Slice the pie while cold and serve immediately. Cover any leftovers with plastic wrap or transfer to an airtight container and store in the refrigerator for up to 4 days.