In a blender or a food processor, add 24 Oreos and pulse until they become a wet powder resembling wet sand. This can alternatively be done by hand in a large Ziplock bag with a rolling pin.
Melt ¼ cup butter and mix with the 2 cups Oreo cookie crumbs.
Press evenly into a 9 inch pie pan and put in the fridge to chill while you prepare the filling.
Filling
In a medium bowl, whisk together 2 (4.2-ounce) boxes Oreo instant pudding mix and 2 cups half and half. Set aside for 5 minutes or so, allowing the pudding to thicken up.
Fold in 1 cup chopped Oreos and pour into your prepared pie crust.
Topping
Beat 1 cup heavy whipping cream and 2 tablespoons powdered sugar until stiff peaks form. Pipe or spread across the top of your pie. Add Oreos for garnish.
Chill the pie in the fridge for at least 6 hours, or overnight, before serving.