For the Crust: Combine chocolate cookie crumbs and graham cracker crumbs in a bowl, add melted butter and stir to combine. Press into a 9 ½-inch deep-dish pie plate creating an even layer on the bottom and the sides, bringing all the way up to the top. Refrigerate while you make the pudding.
For the Pudding and Topping: Make the pudding according to the directions. As soon as you whisk in the vanilla, pour into crust. Refrigerate until set, at least 4 hours. Top with whipped cream and shaved chocolate if desired and serve immediately.
Recipe by Bakepedia at https://www.bakepedia.com/classic-chocolate-pudding-pie/