Step 1

In a large mixing bowl, beat vanilla pudding mix with milk, until there are no lumps. Beat in peanut butter until smooth. Fold in the Cool Whip, set aside.

Step 2

In a 9-inch square baking dish, layer 6 grahams. Top with half of the pudding mix. Top with 6 more crackers and the chopped Reese's PB cups. Top with the remaining of the pudding mix. Finish by topping with the remaining 6 graham crackers.

Step 3

For the frosting, heat unsweetened chocolate with butter and corn syrup on medium heat in a small saucepan. Whisk until smooth. Remove from heat and whisk in the powdered sugar and milk. Frost the top of the graham cracker layer and place in refrigerator.

Step 4

Refrigerate for 4 hours or overnight. Cut and enjoy!