At a children's party, in addition to the birthday child, the cake is always one of the most important elements; impress at your parties and learn how to decorate a colorful children's cake that will surely surprise all the kids, and adults too.
Prepare 2 cakes following the recipe of your choice. Separate the batter into equal-sized portions.
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Paint each batter with a different color; it can be your favorite: blue, red, yellow, orange, etc.
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Bake the cakes and let them cool.
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Cover each layer of the cake with white frosting and stack them on top of each other (Follow this tip here: http://www.kiwilimon.com/supersecretos/secretos-de-cocina/reposteria/como-hacer-un-pastel-de-dos-pisos).
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Cover the entire cake with frosting. Using the M&Ms, decorate the cake. With a piping bag, you can also create shapes like flowers, rainbows, etc.