2 c. graham cracker crumbs (12 whole crackers)
3 1/2 c. or 1 lb. powdered sugar
2 sticks butter, melted
1 c. smooth peanut butter
1 tsp. vanilla

Mix altogether in mixer bowl with mixer. Press into 9 x 13 pan. Melt 2 cups chocolate chips and spread on top. Cut into small bars.