1 stick melted butter
1 1/2 c. graham cracker crumbs
1 (16 to 18 oz.) jar peanut butter
1 lb. powdered sugar
1 lg. bag milk chocolate chips

Mix first 3 ingredients until well blended. Add powdered sugar. Press mixture into large cookie sheet or jelly roll pan. Melt chocolate chips and spread on top. Chill 1 hour. Break or cut into squares before serving.