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How to Make a Rainbow Reveal Cake

Whether you are celebrating a first birthday or a 99th birthday, this insanely clever cake will surprise your whole party.
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The Ultimate Birthday Surprise

No matter how old you are, the excitement of cutting into a birthday cake never dulls with age. But this year, why notreally surprise the birthday guy or gal with a cake that completely ups the ante? Once the cake is cut, each slice reveals the guest of honor's age in the middle of a bursting rainbow of color. And though it looks complicated to make, the process is actually simpler than you think — just take it step by step.
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Make the Chocolate Batter

Prepare the batter for the cake's numbers according to the recipe instructions. Line a 13-by-5-inch loaf pan with aluminum foil, spritz it with a little nonstick cooking spray, and pour in the batter.

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Bake It

Bake at 350 degrees F until a toothpick inserted in the center of the cake comes out clean, about 52 to 58 minutes.

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Cool, Cut and Freeze

Cool the cake in the pan for 10 minutes, then remove it and allow it to cool completely on a cooling rack. Cut the domed top off the cake and 1/4 inch off each end. Slice the cake into 13 equal slices (they'll each be 1 inch thick), and freeze the slices for 1 hour.


Remove from freezer, then cut out numbers from each slice using small (1 3/4-inch) cookie cutters. To remove the cake from the cookie cutters, use a wood dowel to gently push the pieces out.

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