Take one package of Oreos and place the cookies in a food processor. Pulse until the Oreos become a fine crumb texture. Add the melted butter to the crumb mixture and process again.
Transfer the mixture to a pie dish, making sure to evenly spread the buttery crumbs along the bottom and up the sides to create a pie crust. Use a spoon to compact the mixture. Let the dish rest in the fridge for approximately 30 minutes to allow it to set.
Whip the cream with an electric mixer until stiff peaks form. Remove about 1 cup of the whipped cream and place it into a piping bag; refrigerate for later.
Place the second package of Oreos into the food processor, reserving a few whole Oreos for decorating the top. Blend the remaining Oreos into fine crumbs, then transfer to the bowl with the remaining whipped cream. Mix thoroughly.
Gently pour the whipped cream mixture into the set pie crust. Spread it out with a rubber spatula, then pipe whipped cream in patterns on the top and decorate with whole Oreos. Cover and refrigerate the pie for 30 more minutes to let it firm up before serving.