The key to these little sandwich cakes: cookie cutters! (Five-piece square cutter set, $11.99, amazon.com; 28-piece alphabet cutter set, $8.99; 1¼"H; nycake.com)
Step 1: Prepare one box of chocolate cake mix per the package instructions; divide the batter between two 9-inch square cake pans, and bake as directed. Let cool.
Step 2: Level the tops of both cakes. With a serrated knife, slice away the top quarter of each cake. Use a two-inch square cookie cutter to cut nine squares out of each sliced cake top. Repeat with each cake bottom.
Step 3: Figure out what creepy words you want to spell, keeping in mind that you have 18 letters total. Using the alphabet cutters, punch out each letter from your top squares. (Note: If you spell "Trick or Treat," you'll have six top squares and six bottom squares left.)
Step 4: Frost the tops of the bottom squares with white buttercream. Cover each with a top cake square to make sandwiches. Using a pastry bag fitted with a ¼-inch round tip, pipe more frosting into the letter shapes. Finally, turn cakes upside down on a parchment-lined plate, and refrigerate for 20 minutes. Flip sandwiches right side up and remove parchment before serving.
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Reprinted with permission of Hearst Communications, Inc.