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Moon Palace Cake

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To the moon Alice, the Moon Palace! Don’t you just love how cool those moon rocks look on top of this gorgeous moon palace cake? You know what’s even cooler? They’re super easy to make! What cake should I make next?

Moon Palace Cake

My Moon Palace Cake is the ultimate extra-terrestrial experience! It’s made up of layers of peppermint flavoured vanilla cake and vanilla buttercream. But the out of this world wow factor is the moon rocks on top which are so easy and fun to make! To finish it off let your eyes take a ride around this cake with the moon crystal galaxy!

Nick’s favorite thing…

I mean, this looks like a cake, but for all we know it could be some sort of extra-terrestrial dessert wonder! I love how alien it looks. It looks like it belongs to the royal wedding of some tall and monochromatic alien species.

What does moon palace cake taste like?

This cake is made up of my moist and delicious vanilla cake. It’s black on the outside but has an alien rainbow inside (pink, purple and green).

It’s covered in my chocolate Swiss meringue buttercream frosting and has moon rock shards floating around the bottom of it.

On top there are cake pops shaped as moon rocks which I think finished the cake off nicely!

Close up of the side of Moon Palace Cake

What are the ingredients I need for the moon palace cake?


All-purpose flour – also known as plain flour.

Caster sugar – also known as superfine sugar.

Salt – I used fine salt.

Unsalted butter – make sure your butter is softened.

Eggs –  I used large eggs.

Milk – I used cow’s milk but almond milk will also work.

Vegetable oil – you can also use sunflower oil.

Greek yogurt – you may use sour cream instead if you wish.

Vanilla ExtractAlways use good quality vanilla extract when baking, it makes a huge difference. I have a great recipe here for it if you’d like to try your own!

Food gel – I used the chefmaster brand.

Peppermint Extract – I used the ‘Queens’ brand.

Activated charcoal – this is technically food safe. At the time I used it in a lot fo my recipes because it helps you achieve a deep black color. But I do not use it anymore as it can be grainy, and it is not safe for pregnant people and those taking medications. Black food gel is much more preferable and although the color is more of a grey you can mix it with chocolate food gel and get a black color.

Swiss Meringue Buttercream FrostingSuper smooth and totally delicious. Perfect for shiny, sharp cake edges! Grab the recipe here!

Isomalt – Isomalt is a sugar alternative and is used for sugar decorations. It comes as little pellets that you can melt and then pour into moulds or use in any way you would toffee. Unlike toffee, it is clear which makes it a better alternative for coloring.

Lustre dust – I used black lustre dust.

My Top Tips!

  • When melting the isomalt, be really really careful. It gets very hot and will burn your skin.
  • When coloring the frosting, use black food gel with chocolate frosting instead of charcoal as shown in the original recipe and video.

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I hope you guys enjoyed this simple but delicious moon palace cake recipe with me. Please comment in the comments section below, or feel free to share with your family and friends on social media.

I’ll see you all on the following recipe. Happy baking!

N x

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Moon Palace Cake

Moon Palace Cake

ThisMoon Palace Cake is the ultimate extra-terrestrial experience! Layers of peppermint flavoured vanilla cake, moon rocks  and a sugar crystal galaxy!

Serves 30

5 from 2 votes
Print Recipe Pin Recipe
Prep: 40 minutes
Cook: 45 minutes
Total: 1 hour 25 minutes
Course: Dessert
Cuisine: American
Calories: 214kcal



  • 3 1/2 cups (430 g) all-purpose flour
  • 1 1/4 cups (265 g) caster sugar
  • 1/2 tsp fine salt
  • 1/2 cup (125 g) unsalted butter
  • 2 large eggs
  • 1 1/2 cups (375 ml) milk
  • 1/2 cup (125 ml) vegetable oil
  • 2 tbsp Greek yogurt
  • 1 tsp vanilla extract
  • 2 tsp peppermint extract
  • 2 drops purple food gel + 2 drops pink food gel
  • 2 drops green food gel


Moon Rocks

  • 1 1/3 cups (175 g) all-purpose flour
  • 1 1/4 cups (225 g) caster sugar
  • 1/4 cup (50 g) cocoa powder
  • 1/2 tsp bicarbonate of soda
  • 1/2 tsp salt
  • 3/4 cups (175 g) unsalted butter
  • 2 large eggs
  • 3/4 cup (175 ml) milk
  • 3 tbsp food safe activated charcoal (see notes can use 5 drops black food gel instead)
  • 5 tbsp vanilla or chocolate Swiss Meringue buttercream frosting

Learn How To Make it! [VIDEO]


Moon Crystals

  • To make the moon crystals, simply add the Isomalt into a large glass or silicone bowl and microwave for 30 seconds at a time until completely melted.Guys, I can not stress enough how incredibly hot this stuff gets when it’s heated. It will burn your skin off so be very careful!
  • Once the Isomalt is melted add the lustre dust and use a metal spoon to mix until well combined.
  • Once mixed, pour onto a baking tray lined with baking paper or a silicone baking mat and allow to set at room temp.
  • Once set, use a sharp knife to chop into oddly shaped and sized shards.

Moon Rocks

  • To make the moon rocks begin preheating a fan-forced oven to 140°C(275°F) or a conventional oven to 160°C (320°F). Line a baking tray or cake tin with baking paper. Set aside.
  • Add the flour, sugar, cocoa powder, bicarbonate of soda and salt to a large mixing bowl. Mix on low speed with a hand mixer until combined.
  • Next, add the softened butter and continue mixing on low speed until the mixture reaches a crumbly, sand-like texture.
  • Add the eggs and milk and mix again on low speed until all the dry ingredients are incorporated. Scrape down the side of the bowl and mix for a final 20 seconds.
  • Pour onto prepare baking tray or pan and bake for 30 min. Allow to cool completely.
  • Crumble the mixture into a large mixing bowl and add frosting. Mix until well combined.
  • To shape the moon rocks take about 2 tbsp of the mixture in your hands and shape into oddly shaped rocks. You can do small rocks or big rocks, it’s up to you.
  • Take a skewer or the end of a fondant tool that has a small ball on the end of it and poke holes into the rocks to make them appear airy like some sort of alien rock. These are moon rocks after all.
  • Place onto a baking tray and chill in the fridge to set until ready to use.


  • To prepare the frosting simply add the food safe charcoal (see notes) or food gel to the frosting and mix until well combined.


  • Please note: To make the 6 layered cake yousee pictured; you’ll need to double the cake recipe only. All othermeasurements are enough to fill, crumb coat and finish decorating the cake.
    Preheat a fan-forced oven to 140C (280F) or 160C (320F) for aconventional oven. Spray three 8” cake tins with oil spray and line the bottomwith baking paper. Set aside
  • Add the flour, sugar, baking powder and salt to a large mixing bowl and mix together using a hand mixer until well combined.
  • Next add the softened butter and mix on low speed until mixture reaches a crumbly sand like texture.
  • Add the eggs, milk, oil, Greek yogurt, peppermint extract and vanilla extract. Mix on low speed until no dry ingredients are showing. Scrape down the bowl and mix for another 20 seconds. It’s at this point that you can add any additional flavorings or colored gels to the batter.
  • Split the batter into two separate mixing bowls and color one purple using purple and pink food gel and the other green. Mix until well combined. Place each one into a separate piping bag and pipe squiggles of batter into the three cake tins taking care to make sure each one is filled with the same amount of batter.
  • Bake for 50-60 min or until a toothpick inserted comes out clean. If the pick comes out with wet batter, bake for a further 10 min at a time until fully baked. Allow the cakes to cool to room temperature inside the cake tins and then chill them in the fridge overnight. Chilling your cakes overnight makes them easier to trim and decorate. So I bake my cakes the day before I decorate them.
  • To trim your chilled cakes, use a cake leveller or large serrated knife to carefully trim the crust off the top of each cake before you trim each cake in half. You’ll end up with 6 layers of cake.
  • To crumb coat your cake, add a dab of frosting onto an 8” cake board o rflat serving plate. Use a small offset spatula to spread the frosting around before adding the first cake layer. Gently press down the center of the cake layer to make sure it’s stuck to the frosting underneath.
  • Add frosting to a piping bag and frost a ring around the top of the cake. Fill the centre with more frosting. Use your small offset spatula to smoothen out the frosting before you add the next layer of cake. Repeat with the remaining layers.
  • Add more frosting around and top and sides of the cake. Use the small spatula to smoothen out the top and sides of the cake, taking care to fill in any gaps in between each layer of cake.
  • Use a cake scraper (otherwise known as a bench scraper) to smoothen out the frosting on the sides and top. Get it as neat as you can. This should just be a neat, thin layer of frosting which is aimed at trapping any cake crumbs so that random bits of cake crumbs don’t show up on the final layer of frosting.Chill for 2 hours or overnight.
  • Once your cake is chilled, take it out of the fridge and place it back on the cake turn table.
  • Fill a piping bag up with the black frosting and pipe around the cake, starting at the bottom and make your way up. Add some frosting on the top. Use a small spatula to smoothen it out. It doesn’t have to be perfect because we’re coming back to it later. Use a cake scraper to smoothen out the sides of the cake, then use the cake scraper to smoothen out the top.
  • Finish the cake by adding the moon crystals on the side and the moon rocks on top.


Cake can be stored in an airtight container for up to three days.
Activated charcoal – this is technically food safe. At the time I used it in a lot fo my recipes because it helps you achieve a deep black color. But I do not use it anymore as it can be grainy, and it is not safe for pregnant people and those taking medications. Black food gel is much more preferable and although the color is more of a grey you can mix it with chocolate food gel and get a black color.


Calories : 214kcal
Carbonhydrates: 19g
Protein: 4g
Fat: 9g
Saturated Fat: 5g
Polyunsaturated Fat: 1g
Monounsaturated Fat : 2g
Trans Fat : 1g
Cholesterol: 44mg
Sodium: 116mg
Potassium : 95mg
Fiber: 1g
Sugar : 3g
Vitamin A: 298IU
Calcium: 33mg
Iron: 1mg
Nutrition Disclosure
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