This Halloween treat starts with boxed cake mix. Devil’s food cake mix is combined with water, oil, eggs and chocolate pudding mix. The batter is scooped onto a lined baking sheet. Once the batter circles are baked and cooled, the whoopie pies are filled with colored cake icing. Decorative sprinkles can be pressed into the edges before serving. These whoopie pies are a tasty, festive treat for a party or your trick-or-treaters.