As adorable as this caked turned out, it was a mess to make! The inside of the cake was six layers with each layer being a color of the rainbow, filled with white buttercream. Once all of the layers were stacked, I covered the cake in a thick layer of buttercream and slowly sprinkled rainbow nonpareil sprinkles on the buttercream.
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This was a huge mess and I am going to find these little round sprinkles for weeks! The trick I quickly learned was to place a large round cake pan under the cake to catch all of the sprinkles that didn’t attach to the cake. Also slightly tilting the cake with one hand and using the other to pat the sprinkles into place helped more to adhere. After several layering of sprinkles, I moved on to making the rainbow for the top of the cake. I used 20 gauge jewelry wire and formed an elongated “U” shape. I then covered the curve of the “U” part of the wire with purple fondant. The second layer I just used a little sugar water to “glue” the blue fondant to the purple. I repeated this proves until I had all the colors of the rainbow. The two long ends of the wire were pushed into the cake. I added a few small skewers to help hold the rainbow upright. I covered the skewers with white buttercream, piping it to look like white fluffy clouds. I finished the cake by piping more clouds all over the top of the cake. There was even a sweet little matching smash cake that looked like a giant cupcake for this sweet little rainbow baby’s birthday!
