Chocolate Peanut Butter Whoopies

• 2 cupsicing sugar
• 1 egg
• 1 filling
• 1 press gently filling to stick (into)
• 325 ml buttermilk
• 250 gr all purpose flour
• 200 gr granulated sugar
• 190 gr golden crisco shortening
• 120 ml milk
• 120 ml creamy peanut butter