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Galaxy Ganache Cake

I was tasked to make another galaxy themed cake, but had already made a galaxy mirror glaze cake! After a bit of thought, I decided to make some galaxy colored cake layers, cover the cake in a gothic black ganache. This cake design is inspired by Sweetapolita!  I also added some of my favorite sprinkles from Neon Yolk Shop and Fancy Sprinkles. The recipes used can be found below:

My Favorite Vanilla Layer Cake Recipe

Chocolate Ganache Filling

I made four, seven inch cake layers, which I colored two shades of blue, and two shades of purple.

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I then covered the cake with room temperature dark chocolate ganache, which I colored black with gel food coloring.  I’ve found that dark chocolate ganache is MUCH easier to color a true black than frosting. You can use the same techniques to smooth ganache that are used to smooth buttercream!

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I added a sprinkles around the base, and piped on some ganache drops using a piping bag.

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And that’s it! No fancy tips, no additional components, just a lot of ganache, and some colorful cake layers 🙂

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Leah K

Friday 8th of July 2022

I loved the galaxy cake!!! Can you convert it to grams, though, Chels?


Tuesday 12th of July 2022

Hi Leah,

Oh man, this is a super old recipe!! I believe if you click on the recipe links included, the recipe cards have both grams and cups. Usually I share a specific recipe card for each cake post I make with both grams and cups, but this is from 5 years ago before I started doing this full-time. Hope that helps, happy baking!


Tuesday 26th of June 2018

what kind of dark chocolate do you used? I love your cakes!


Wednesday 27th of June 2018

I like using the whole foods brand!


Friday 16th of March 2018

With the cake being iced in ganache, does it need to be kept in the fridge or is okay sit out on the counter? I just don't want the ganache to harden too much before I serve it.


Sunday 21st of April 2019

it will firm up either way! It can definitely sit out at room temp. I would recommend running your knife under hot water (and drying it) to cut into this cake, to help you get clean slices!


Monday 26th of June 2017

What colors did you use to color the cake? I love the vibrant shades ??


Wednesday 28th of June 2017

I used americolor gel in the electric blue, electic purple, royal purple, and classic blue shades!


Tuesday 20th of June 2017

This looks so similar to one of Sweetapolita's cakes from her blog. But she starts with black cocoa powder so you don't have to use a ton of black food coloring. Not sure if you are as well.


Thursday 22nd of June 2017

I actually didn't use much to color the dark chocolate ganache! That's the beauty of using ganache instead of frosting to cover the cake!