This Apple Cider Whoopie Pie recipe makes soft, delicious cookies that taste like apple cider doughnuts! Made with apple cider, cinnamon, apple butter, they're the perfect fall treat. They're coated with cinnamon sugar and stuffed with either bourbon caramel buttercream or brown sugar cream cheese icing. Bonus: these Apple Cider Whoopie Pies are baked, not fried!