1. Melt butter into a 12 X 12 X 1 1/2 round tart pan.
2. Crush six lg. chocolate graham crackers and press into the butter in the pan and set aside.
3. Mix cream cheese,sugar & peanut butter together until smooth.
4. Fold in one 8 oz. tub of Cool Whip. Pour into the tart pan,cover and chill for several hours .
5. Decorate around the edges with the 1/2 tub of Cool Whip. Makes 12 generous servings.