Unicorn Cake Recipe - How to Make & Decorate

This unicorn cake recipe makes a great special occasion cake and kids’ birthday cakes. It is also a great idea if you are looking for rainbow cakes. The rainbow colored mane on the cake is perfect for rainbow themed parties.

The cake was decorated entirely in fondant and has big twinkly eyes and rainbow-colored mane. Since it was a 2 tier cake, the large eyes filled up the front of the cake nicely.

The unicorn’s mane, on the other hand, was made using lots of simple fondant flowers in the colors of the rainbow. Each color came in 3 different sizes. Though it looks like a lot of work with the flowers, they were in fact quite easy and fun to make.

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Unicorn Cake Recipe : How to Make and Decorate

Main supplies for the birthday cake:

• Cake - This was a 2 tier round cake with the top tier measuring 6 inches and the bottom tier measuring 9 inches. Each tier measured 6 inches in height. The cake itself was made in 2 flavors - top tier was a marble cake (click here for the recipe) and the bottom tier was orange cake (click here for my orange cake recipe).
• Buttercream - Each tier consisted of 3 cake layers and filled with buttercream. I also used buttercream to crumb coat the cakes before covering them with fondant.
• Fondant - I used Satin Ice in white to cover the cakes. I also used Satin Ice to make the unicorn horn, floral mane, the eyes, and the upright alphabets.
• Edible gold paint - I used the gold paint for the unicorn's horn and ears as well as to paint the birthday girl's name.
• Shortening - Shortening was used to attached the unicorn eyes to the cake as well as to attach the flowers.
• Purple satin ribbon - This was used to cover the sides of the cake board, and as borders for each of the cake tiers.
• Fondant glue - I used this glue to attach the upright alphabets, and ears on the cake.
• CMC powder - This was added to the fondant when making the 3D deco (horn, flowers, ears and name) to help these deco pieces set firmly.
• Food coloring - Americolor and Wilton gel based food colors.
• Gum paste flower cutter or flower shaped cookie cutter - for the unicorn's mane.
• Flower former to shape the fondant flowers.

Baking the cake:

• Grease your cake pans with vegetable oil or shortening. Line them with parchment paper or dust them with flour.
• Start with the orange cake layers. Follow the instructions provided in the recipe card below to prepare the cake batter. Once ready, divide batter into the prepared cake tins and bake until a skewer inserted in the center of the cakes come out without any wet batter sticking to it.
• Similarly for the marble cake, follow the instructions in the recipe card. To achieve the marbled effect, estimate one third of the batter and transfer batter into a small bowl. Add cocoa paste to it and mix well. Alternate the plain vanilla batter and chocolate batter into the prepared cake pans and use a jam knife to cut through the cake batter for a marbled effect.
• Bake cakes until done. Cool cakes on wire racks. Once they turn warm, wrap them in plastic wrap and refrigerate to cool completely before frosting and assembling the cake.

Assembling the cake:

• To begin with, I prepared the unicorn horn and the flowers first. Since both require time to set, I made them 2 days in advance. I have 2 separate tutorials with detailed instructions on how to make the horn and the flowers, you can check the details out there.

• Next were the cakes. I leveled and filled the layers of cake with buttercream. And then I applied a thin layer of buttercream as the crumb coat and covered each tier separately in fondant. I then stacked them on top of each other with the support of bubble tea straws. I also covered the cake board with fondant.

• The first decoration that went on the rainbow unicorn birthday cake was the unicorn eyes. I drew the eyes on a parchment paper and cut them out of fondant. Click here to learn how I created and attached the unicorn eyes to this birthday cake. 

• I also wrapped the cake board and each tier with purple satin ribbon. Next was the gold horn. I positioned it on the top tier.

The cascading rainbow unicorn’s mane

• And then, I marked the line for the unicorn's rainbow colored mane using tiny pinches of fondant:

• Once I was able to visualize the position of the unicorn’s mane using the tiny fondant pinches, I replaced them with a long strip of fondant that started from the unicorn horn at top of the cake, flowing down the back and side and ending towards the bottom front of the cake.

• This fondant strip was to guide the placement of rainbow-colored fondant flowers as well as to provide a slight bump so that the flowers do not appear too flat on the cake especially on the top layer of cake.

• And then I arranged the flowers on the birthday cake. I started with larger flowers first. Red flowers went first. 

• Followed by the orange and yellow.

• Next were the green, blue and pink flowers:

• And the final color in the order was light lavender color. This was in the order of rainbow colors too.

• And I continued with the placement of  the flowers, but this time is the reverse order of the rainbow colors, starting with pink, followed by blue, green, yellow, orange, and red:

The unicorn ears

• Once I had the flowers in order, I made the ears for the unicorn birthday cake. I dusted my work surface with icing sugar and rolled a piece of white fondant with considerable thickness as shown:

• I drew the ear template on a piece of paper and cut out two pieces of fondant ear shapes for the 2 ears:

• For the inner part of the unicorn ears, I trimmed thepaper template and marked the shape on each ear using my needle tool.

• I then curved the base of the ears and left them in a upright position to set. Using the same edible gold dust and lemon extract mixture as the horn, I painted the ears as shown below. You can also add some edible glitter to the ears for a more magical effect to the cake.

• To place the ears on the unicorn cake, I had to make slight adjustments to the flowers on the top tier by removing one of the orange flowers.

• And then, I attached the ears with fondant glue.

• The next step was to fill the gaps in unicorn's mane with the medium and small flowers. I also placed a few red flowers on the front of the unicorn horn as shown:

• This was how the back and side of the rainbow unicorn cake looked like with all the flowers on it:

The birthday girl's name in fondant

• Once I have put all the flowers, I went on with the wordings for the birthday cake. I placed the birthday girl's name in upright font on the cake board, totally away and outside of the cake . To make the upright standing alphabets, I rolled some fondant (mixed with a little CMC powder) to a thickness of about ¾ cm and cut the letters out using the cutters below:

• I then painted just the surface of the letters with gold paint. Again, similar to the ears, you can decorate these fondant letters with edible glitter if you like.

• I let the paint dry and then attached the letters to the cake with fondant glue so that they stay in place securely:

• And that completes the unicorn cake tutorial. This was how my completed cake looked like:

Here was how the rainbow unicorn birthday cake looked like sideways:

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Notes

Can you use this unicorn cake recipe and decorate it with buttercream?

Yes, you can.

• Bake the cakes as instructed in the recipe card below. Once baked, let the cakes cool slightly on a wire rack.
• Level, fill and crumb coat them the same way you do for fondant covering, but instead of fondant, coat the cakes with a final layer of buttercream.
• You can also choose to decorate the unicorn's mane with piped rosettes to replace the fondant flowers.

Can you make the unicorn cake in vanilla flavor?

• The unicorn cake recipe on this page uses 2 different flavors. Top tier is a marble cake and bottom tier is an orange cake. You can customize the cake flavor into a single flavor.
• If you prefer a plainer vanilla cake recipe, use my butter pound cake recipe which is flavored with vanilla extract.

Can you use a box mix in place of the unicorn cake recipe?

• Yes, you can. You can bake your cake using white cake mix or your favorite box mix or flavor. Follow the box instructions in baking the cakes.

How to ensure this unicorn cake recipe makes a soft and moist cake?

• Follow the baking instructions closely. Place the cakes on wire racks to cool and cover the cakes with a kitchen towel until they turn warm. Covering them with kitchen towel helps prevent the cakes from becoming dry.
• Once the cakes turn warm, remove the kitchen towels and wrap the warm cakes in plastic wrap. Refrigerate the wrapped cake layers until they become cold. This process of wrapping the entire cake layers and refrigerating them helps lock the moisture in the cake, making them moist.
• Another tip is to make sure not overbake the cakes. Test the cakes by inserting a skewer in the center 5 minutes before the baking time is up. Turn off the oven if the skewer comes out without any wet batter sticking to it.

Alternative options for the fondant flowers

• If you wish to decorate the unicorn's mane in buttercream, you can replace the fondant flowers with buttercream rosettes. The buttercream rosettes can be used on a fondant covered cake as well as a buttercream covered cake.
• Prepare vanilla buttercream frosting in a large bowl and then divide it into smaller separate bowls to tint the icing in rainbow colors. Fill the icing into separate piping bags and snip the pointed ends.
• Fit a large star tip in a separate piping bag. To start with, insert the red buttercream filled piping bag into the star piping tip fitted piping bag. Start piping the rosettes in place of the fondant flowers, following the order of the colors as with the fondant flowers above. Once the red is done, remove the red icing filled piping bag and fit in the next different color. Continue to pipe rosettes in all the colors until the unicorn's mane is completed.

Alternative option for the fondant unicorn horn

• An easy alternative for the fondant unicorn horn is a horn made out of ice cream cone.
• Use the ice cream cone as the base, roll your fondant into thin strip and wrap it around the cone, starting from the pointed tip of the cone all the way to the other end. Make sure you do not leave any gaps. Paint the fondant in gold paint.

Can you outline the unicorn eyes in buttercream?

• If your piping skills are good, you can decorate the unicorn's eyes in buttercream. Use black frosting and small round piping tip to pipe eye outlines and the lashes.

Storing the cake

• This cake is best stored at room temperature, preferably in an air conditioned room. This will ensure the fondant does not become soggy from the humidity in the air. Air conditioned room is also the best way to store a buttercream covered cake.

Like this unicorn cake recipe and tutorial? Here are my other posts you might want to check out:

• Fondant Unicorn Horn Tutorial
• How to Make Fondant Unicorn Eyes for Cakes
• Fondant Rainbow Tutorial
• Rainbow Fondant Letters Tutorial
• Rainbow Birthday Cake - A Decorating Tutorial

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Recipe (Printable)

Here is the full printable version of my unicorn cake recipe and decorating tutorial.

And that's my unicorn cake recipe and cake decorating tutorial for you.

Happy decorating 🙂