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How to make the Best Ever Rainbow Cake | Cupcake Jemma

There isn’t a person on earth who isn’t a fan of rainbows, right? Right?? Well, if there is then they must be very sad and lonely. But you and I know that rainbows are magical and brilliant and what better way to give the rainbow the respect it deserves than to embody it in cake form.

This one's quite a lengthy watch, so put the kettle on, put your feet up and prepare for some top tips for baking and decorating the perfect Rainbow Cake. This video is going to knock your socks off!


For the cake –
9 tbsp whole milk
1 ½ tsp vanilla extract
Various colour pastes (red, orange, yellow, green, blue & purple)
750g soft unsalted butter
750g caster sugar
9 large free-range eggs
750g sifted self-raising flour
Butter & flour for preparing the cake tins

For the buttercream –
400g soft unsalted butter
900g sifted icing sugar
5-6 tbs whole milk
½ tsp vanilla extract


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  1. i had a question since i first saw a rainbow cake
    the question is that why can’t we have seven layers instead of six?

  2. awsome hats off

  3. i don’t like rainbows but i do like real rainbows😂

  4. subscribed

  5. Going to try to make this next week for my daughter’s 3rd birthday. Hopefully it comes out good thank you for the recipe. 😄

  6. just made this cake for my sister

    She loved it 😘

  7. Can you do a tutorial on how you do your wing liner? Thanks

  8. This seems like a lot of work. I’d rather just buy it. lol

  9. This single video taught me so much about cake decorating techniques. Thank you!

  10. How to make egg las cake p.z

  11. My sponges & icing was the best ive ever made, following ur video Jemma!
    But crumbcoating??!! Impossible. Not only did the crumbs go in the icing but parts of the cake were falling off.
    I levelled my cakes to the thickness u said & trimmed the edges but it was so high & wobbly.
    Ended up in the bin 😏

  12. wow thats amazing

  13. DO you have to wait for the cakes to cool to cut them and decorate?

  14. Bilqees X Ledgister

    it worked really well thanks jem!!

  15. nice cake

  16. What is whole milk??

  17. Hi Jemma
    How far in advance could the cake be made (not decorated) & how would you suggest storing then before decorating stage please

  18. ورد البنفسج


  19. What if my oven can only fit 4 pans at a time? Can I leave the extra 2 pans of batter in the fridge first and then bake it once the others are done? Or will that somehow change the texture of the cake? Any advice how to go about this little hiccup?

  20. Hi Jemma, I don´t have the “chic,” self-self rasing flour. Could you, please let me know how much baking powder I should add to the mixture? Thank you!

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