1Pour milk into large bowl. Add pudding mix and beat with wire whisk for 2 minutes or until well blended. Add peanut butter and mix well. Gently stir in whipped topping.
2Layer 1/2 of graham crackers and half of the pudding mixture in 9 x 13" pan, breaking graham crackers if necessary to fit. Repeat layers, topping with graham crackers.
Microwave chocolate and butter on medium heat for 1 1/2 minutes, stirring after 1 minutes. Stir completely melted and then spread over graham crackers. Refrigerate at least 8 hours. Keep refrigerated. YUMMY!!