1 1/2 c. graham cracker crumbs
1 box (1 lb.) powdered sugar
1 c. (1/2 lb.) melted butter
1 c. creamy peanut butter
1 lg. bag (12 oz.) chocolate chips

Mix powdered sugar and graham cracker crumbs in a large bowl. Add the melted butter and peanut butter and stir until well blended. Spoon mixture into ungreased 9 x 13 pan and press firmly into an even layer. Chill until cold, about 45 minutes. Melt chocolate chips over low heat stirring until smooth. Spread chocolate evenly over the chilled mixture. Refrigerate 10 minutes until chocolate is firm. Cut into small squares. Store at room temperature.