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A rainbow unicorn cake with colorful frosting and closed-eye designs sits on a stand. Two plates hold slices revealing bright pink, yellow, green, and blue layers wrapped in white icing.

How to Make a Unicorn Cake

This Rainbow Unicorn Cake features colorful rainbow cake layers, fluffy vanilla buttercream frosting, and whimsical unicorn decorations that make it the perfect centerpiece for birthdays and special celebrations. Easy to customize with your favorite cake flavor and colors, this magical cake is sure to impress kids and adults alike.

Course desserts
Cuisine American
Keyword How to Make a Unicorn Cake, Rainbow Unicorn Cake, Unicorn Cake
Prep Time 10 minutes
Cook Time 15 minutes
Additional Time 2 hours 30 minutes
Total Time 2 hours 55 minutes
Servings 1 cake
Author momma lew

Ingredients

  • 2 White Boxed cake mix
  • Buttercream icing
  • Unicorn sprinkles mix
  • Unicorn cake topper
  • Electric Gel Colors

Instructions

  1. Prepare cake mix according to box instructions.
  2. Separate the cake mix into four bowls using electric gel colors 1 to 2 drops of coloring will be enough for a favorite cake color.
  3. Lightly grease cake pans and line bottom of the pan with parchment paper.
  4. Pour batter into pans and bake according to box instructions.
  5. Because these are 1 inch cake layers they may cook faster than your box tells you. Begin to check them at the 15 minute mark.
  6. Cakes are done when you stick in a toothpick in it and it comes out clean.
  7. Remove from oven and allow to cool at room temperature until the cakes can be wrapped in plastic wrap in the freezer.
  8. Make your buttercream.
  9. Crumb coat the cake with a thin layer of vanilla buttercream making sure to put the buttercream in between each layer as you build a cake.
  10. Allow the cake time to rest before moving on to the next step. The buttercream will crust over, meaning when you touch it with your finger after about 15 minutes the Icing is no longer wet.
  11. Prepare your colored frosting and put into piping bags with star tips. While using a color is not necessary for this particular activity it will be helpful to change the tips out.
  12. Remove the unicorn horn cake topper and the ears from its package and center at the top of the cake.
  13. After placing the unicorn horn topper on top of the cake select your eyelashes and placing them as symmetrical as possible.
  14. A medium stiff consistency icing is going to be required to create the roses on top of the unicorns head using a star tip we will be able to create roses on top of the cake.

Recipe Video

Recipe Notes

How to Store Your Unicorn Cake

Store your cake in the refrigerator until you are ready to display your beautiful rainbow unicorn cake on a cake stand. You may need to adjust your refrigerator's shelves to help the cake fit.