In a large bowl, mix together the pudding mix, and milk. Beat well until pudding is a thicker consistency

Fold in the thawed Cool Whip

Spray a 9x13 dish with cooking spray

Lay one layer of graham crackers. Break graham crackers to fit

Layer half the pudding mixture

Lay another layer of graham crackers

Layer remaining pudding mixture

Lay the last layer of graham crackers

Remove lid and heat frosting in the microwave for 30 seconds

Pour and spread frosting on the last layer of graham crackers

Cover and let sit for 24 hours