Layer one layer of graham crackers to the bottom of your dish. If you need to cut one to size just use a serrated steak knife and gently trim on one edge and/or the corners so the cracker sits nicely in the dish.
Next layer about 1/2 of the pudding, then continue with another layer of graham crackers, the rest of the pudding (minus a couple tablespoons) and the final layer of graham crackers and then lightly coat with the two tablespoons of pudding. Using an offset spatula helps to even it all out nicely.
Add the whipped topping, as mush as will fit and then top with some crushed graham crackers and then a dusting of powdered sugar, for garnish.
Refrigerate at least 4 hours, overnight is best, then enjoy!