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Home » Cakes » How to make a Galaxy Unicorn Cake – Decorating Video Tutorial

How to make a Galaxy Unicorn Cake – Decorating Video Tutorial

By Ashlee Marie 4 Comments

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This Dark Galaxy Unicorn Cake was the centerpiece for my daughters sweet 16th birthday party.  Unicorn cakes are easy to make and always such a fun treat!

hand painted fondant and buttercream unicorn cake

How I designed this galaxy unicorn cake

We’ve all seen the fun unicorn cake all around the internet – so when my daughter wanted a galaxy unicorn birthday party I was so excited to try my hand at one!

I decided to go for a tall cake, so I went with with 8 layers of 7 inch cakes – that way I got the narrow tall cake but it was still sturdy.  

We knew we wanted to go with a dark base, even the party decorations used a dark base for everything.  Then we chose fuchsia, turquoise, blue and violet as the colors we wanted to bring into the cake, food and backdrops of the party to create the sea of clouds and clusters of star you see in gorgeous galaxy photography. 

And of course we accessorized with gold for the horns, ears and eyelashes! But you could easily go with silver if that’s what you prefer. 

I decided on a fondant cake so that it would be easier to paint the sides but stuck with a classic buttercream for the colorful rosette mane.  I used a 1B tip for all the large rosettes then used smaller star tips (open, closed, french, etc…) to add all the extra pops of color throughout the mane.

And while I TOTALLY forgot to take a picture of the inside of the cake it matched all the colors we used in the mane! 

galaxy unicorn cake video

How I created this galaxy unicorn cake

– Start by making the horn and ears so they can dry – I used black modeling chocolate as a base – I like the dark base under the gold for depth.

– I used 2 cone shapes twisted over a skewer to create the horn and 2 sizes of extra large rose petals around skewers to create the ears

– The dark and beautiful colors of the galaxy were the inspiration here, so for the fondant base we mixed black and navy

– To create the colors of the “clouds” and stars of the far away galaxy’s we mixed white food coloring mixed with the bright shades of fuchsia, turquoise, blue and violet we were using in all the party decorations and food

– Using a natural sponge I created the “clouds” and stars by dabbing the colors all around the cake (leaving room for the eyes and cheeks.)

– Then I used the straight gel colors to create a darker layer over the brighter colors to create depth

– Then I colored a large batch of buttercream with the same fuchsia, turquoise, blue and violet colors.  I used 1B large closed star tips for the rosette main, then various smaller star tips (open, closed and french) to add all the smaller rosettes and stars along the mane.

– Then add the horn and ears to the cake

– Roll out a fondant snake, tapering both ends, for the eyelashes – then cut 2 small tapered pieces for the extra eyelash – and add them to the fondant and paint them gold

hand painted galaxy unicorn cake with buttercream mane

To make this unicorn cake you’ll need

  • 6 seven inch cake layers
  • chocolate ganache
  • navy fondant
  • Black fondant
  • fondant smoothers
  • black modeling chocolate (optional) recipe here
  • skewers
  • super gold luster dust
  • paint brush
  • white food coloring
  • fuchsia, turquoise, navy and violet gel food colorings
  • natural sea Sponge
  • buttercream recipe
  • 1B tip
  • various smaller star piping tips
  • piping bags

Galaxy Unicorn Birthday Cake Decorating Tutorial

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sweet 16 unicorn cake

If you love making amazing cakes you’ll love these other cake decorating tutorials!

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Doctor Strange Cake | Golden Snitch Cake | Tamatoa Cake

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Continue to Content
galaxy unicorn cake decorating video

How to make a Galaxy Unicorn Cake - Decorating Video Tutorial

Yield: 1 cake
Prep Time: 30 minutes
Active Time: 1 hour 10 minutes
Baking Time: 40 minutes
Total Time: 2 hours 20 minutes
Difficulty: easy

THIS DARK GALAXY UNICORN CAKE WAS THE CENTERPIECE FOR MY DAUGHTERS SWEET 16TH BIRTHDAY PARTY. UNICORN CAKES ARE EASY TO MAKE AND ALWAYS SUCH A FUN TREAT!

Materials

  • 6 seven inch cake layers
  • chocolate ganache
  • navy fondant
  • Black fondant
  • black modeling chocolate (optional) recipe here
  • skewers
  • super gold luster dust
  • white food coloring
  • fuchsia, turquoise, navy and violet gel food colorings
  • buttercream recipe

Tools

  • 7 inch cake pans
  • frosting spatula
  • turn table
  • fondant smoothers
  • paint brush
  • natural sea Sponge
  • 1B tip
  • various smaller star piping tips
  • piping bags

Instructions

  1. Start by making the horn and ears so they can dry - I used black modeling chocolate as a base - I like the dark base under the gold for depth.
  2. I used 2 cone shapes twisted over a skewer to create the horn and 2 sizes of extra large rose petals around skewers to create the ears
  3. The dark and beautiful colors of the galaxy were the inspiration here, so for the fondant base we mixed black and navy
  4. To create the colors of the "clouds" and stars of the far away galaxy's we mixed white food coloring mixed with the bright shades of fuchsia, turquoise, blue and violet we were using in all the party decorations and food
  5.  Using a natural sponge I created the "clouds" and stars by dabbing the colors all around the cake (leaving room for the eyes and cheeks.)
  6. Then I used the straight gel colors to create a darker layer over the brighter colors to create depth
  7. Then I colored a large batch of buttercream with the same fuchsia, turquoise, blue and violet colors. I used 1B large closed star tips for the rosette main, then various smaller star tips (open, closed and french) to add all the smaller rosettes and stars along the mane.
  8. Then add the horn and ears to the cake
  9. Roll out a fondant snake, tapering both ends, for the eyelashes - then cut 2 small tapered pieces for the extra eyelash - and add them to the fondant and paint them gold

Did you make this project?

Mention @ashleemariecakes or tag #makesomeawesome and I'll share your image in my Instagram stories.

© Ashlee Marie
Project Type: cake decorating / Category: Cakes
unicorn pajama party
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With the right tips and tricks, I believe YOU can make, bake, or create anything. This is what I love to do - make some awesome, teach you how, and give you that boost of culinary confidence you need to rock your own kitchen!
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Reader Interactions

Comments

  1. Michelle Crown

    August 10, 2019 at 12:03 pm

    Hey Ashlee,

    Thank you for this amazing recipe. Just wanted to let you know that your recipe is featured on our new series

    We have listed some of the best unicorn cake recipes. Congrats!
    Please keep posting delicious recipes as always.

    Love.

    Reply
    • Ashlee Marie

      January 4, 2020 at 4:02 am

      thank you so much

      Reply
  2. Ritika

    September 30, 2019 at 4:24 am

    AMAZING! The cake looks so adorable I love the way you decorate. unique idea.

    Reply
    • Ashlee Marie

      November 19, 2019 at 11:34 pm

      Awww thank you so very much! You are so sweet.

      Reply

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