6. Assemble the Whoopie Pies: Spread Filling onto the Flat Side of One Cake Using a Knife or Spoon. (Alternatively, You Can Use a Pastry Bag with a round Tip to Pipe the Filling onto the Cakes, Which Will Give You a Smoother, Neater Presentation.) Top It with Another Cake, Flat-side down. Repeat Wit the Rest of the Cakes and Filling. Roll the Edges in Crushed Candy Canes

Whoopie Pies Are Best Eaten within a Day of Making Them. Store in a Wide, Shallow Container Arranged in a Single Layer for up to 3 Days. You Can Also Wrap Them Individually in Plastic Wrap