In a large mixing bowl, combine the vanilla pudding mix and cold milk. Whisk together until smooth and thickened, which usually takes about 2 minutes. Stir in a splash of vanilla extract for an extra layer of flavor.
Gently fold in the whipped topping into the pudding mixture until fully incorporated. This will give you that light and airy texture that makes the dessert so indulgent.
In your 9x13 inch baking dish, lay down a single layer of graham crackers. Spread half of the pudding mixture over the crackers, smoothing it out with your spatula. Layer more graham crackers on top of the pudding, then spread the remaining pudding mixture evenly over this second layer.
Finish with another layer of graham crackers. To create the decadent chocolate topping, spread the chocolate frosting evenly over the final layer of graham crackers. If you want a little extra flair, sprinkle some chocolate shavings or chopped nuts on top.
Cover the dish with plastic wrap and refrigerate for at least 4 hours, though overnight is best. This allows the graham crackers to soften and the flavors to meld beautifully.
Once chilled, cut into squares and serve. Enjoy the creamy, decadent layers with a satisfying crunch.