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

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