In a medium bowl, mix melted butter with crushed graham crackers and sugar. When mixture looks like wet sand, press it into the bottom and sides of a standard 8-inch pie pan.
Make filling:
In a medium bowl, fold pudding into whipped topping until fully blended.
Assemble pie
With a sharp knife, slice muffin bottoms in half horizontally, so you have two circles from each muffin bottom. Place six slices on graham cracker crust to create a muffin bottom layer. Using half of the whipped topping pudding mix, layer over the muffin bottom layer, filling in the spaces between muffin pieces. Place remaining six slices of muffin bottoms on top of that, and finally add remaining whipped topping/pudding mix to cover muffin pieces.
Top with whipped cream and garnish as desired. Refrigerate at least one hour before serving.