Clean the cake pans and repeat the baking and cooling process with the remaining three cake layers. Pipe buttercream. Pipe buttercream frosting around the outside edge of your cake. Then either continue to add buttercream to make an even layer in the center of your cake, or fill it with a flavored filling of your choice. Add the final layer of cake on top, the frost the outside of the cake. Feel free to use my tutorial for frosting a smooth cake, if you like.

Add the colored cake batter to the cake pans. Starting with the purple batter, add spoonfuls of batter around the bottom of the pan. Divide each color evenly between the three pans. Give the pan a little side-to-side shake to distribute the batter around a bit between each color. After the purple, add the blue, then green, then yellow, then orange and finally red. Prep. Preheat the oven to 350 degrees Fahrenheit and grease three 8-inch round cake pans with cooking spray.

Rainbow cakes are typically made for birthdays, but they are great for any occasion where people want something eye-catching and festive! Gel food coloring is easier to work with than liquid. Particularly when coloring cake batter, icing, or frosting. It can be found in all the same locations as the clear vanilla extract listed above! Level the cake rounds. Level each of the cake rounds, then spread a small amount of buttercream beneath where the center of the cake will sit to hold it in place. Put the first cake layer on top on your serving plate or a turntable.

I use a large metal scraper to decorate the sides of the cake, and a small angled spatula to also help cover the sponges – and its much easier and you are going to get a smoother finish using these as well! Color the batter. Once the cake batter is mixed well, divide it into 6 equal portions. (You can use more or less colors, or opt for whatever colors you like.) Color each portion of batter a different color with gel food coloring, mixing until the color and batter are thoroughly combined. As the name suggests, this rainbow cake is a super fun and colorful dessert that’s guaranteed to brighten up your day. Just as I have finished the buttercream I carefully press in some rainbow sprinkles to the bottom of the cake for a bit of colour and I just love the design – be warned, sprinkles will fall off at this point so beware! After this, I chill the cake again! A rainbow cake is a type of multi-layered cake that uses several colors of frosting, each representing one of the colors in the visible spectrum. TMNT Birthday CakeRemember, white velvet cake is best for this recipe. Also, it is very white to add the colors you want for the rainbow layers easily. Additionally, adding colors to a cake with egg yolks will change your colors while baking. Finally, keep in mind that white velvet cake will not go over mix when adding your color. Shortening: Shortening is the secret ingredient for creating frosting with a melt-in-your-mouth texture. In a large mixing bowl, use an electric mixer to beat the cake mix, water, oil, and eggs on low speed for 30 seconds, then on medium speed for 2 minutes. Scrape the bowl occasionally. Make the batter. In a large mixing bowl with an electric mixer, beat the cake mix, water, oil, and eggs on low speed for 30 seconds. Then, continue to beat the batter on medium speed for 2 minutes. Don’t forget to scrape the bowl occasionally.