In a bowl, whisk pudding mix and milk until smooth. Fold in whipped topping.

In a 9×13 dish, layer graham crackers to cover the bottom.

Spread half the pudding mixture over the crackers. Add another graham cracker layer.

Spread the remaining pudding mixture on top, then add a final graham cracker layer.

Microwave frosting (without lid and foil) for 15 seconds, stir, then spread evenly over the top.

Cover and refrigerate overnight to let the crackers soften. Slice and enjoy!