Rainbow Swirl Cake

This rainbow swirl cake is easier to make than you may think! Dress up a boxed cake mix.

Rainbow Cake Recipe and Tutorial


My baby boy turned 2 this week. He lives his life with such joy and you just can’t be near him without laughing. And he’s wild. He deserved a Rainbow Swirl Cake.

I love how he sings his ABCs at the top of his lungs.

I love how he says “Hi! How you doin’?” to every single person he makes eye contact with.

I love how he does somersaults when he is excited,

and tells people to clap whenever he completes a puzzle.

While I could do without him climbing on top of our kitchen table

I love when he gives me that ornery little grin when he’s been caught.

Rainbow Cake Recipe and Tutorial

I love his wet, sticky kisses

and his ticklish little baby toes.

I love how he watches Yo Gabba Gabba even while staying in constant motion

and how he can fall asleep upright in his rocking chair reading a book.

I just love him to pieces. ♥

Rainbow Cake Recipe and Tutorial

Making a rainbow swirl cake is very easy- I hope you’ll try it sometime. I snapped a few pictures with my phone along the way.  Oh yes- he liked the cake 😉

Rainbow Swirl Cake from @KatrinasKitchen

Rainbow Swirl Cake


Yield: 1 cake

Prep Time: 30 minutes

Total Time: 60 minutes

This rainbow swirl cake is easier to make than you may think!


  • Yellow (or white) cake batter, divided
  • Gel food dye (I use Americolor)
  • Buttercream frosting


  1. Prepare your cake batter as you normally would and divide into however many sections that you would like.
  2. Use food dye to color your cake batter. If you use gel or paste then you will only need 1 drop per section for a brilliant, deep color.
  3. Drop your batter into the pan one color at a time and bake as normal.
  4. Frost and enjoy!

A Few Notes on Food Coloring

Difference between food color gel and decorating gel

  • I used Americolor GEL food coloring which can be purchased online or at Hobby Lobby (Amazon link provided at the end of this post).
  • Food color gel is NOT decorating gel.
  • Wilton also makes gel food coloring (available at Wal-Mart, Michaels, and JoAnne’s). I do not prefer it but it is more readily available and would produce better results than using liquid food color found in most grocery stores.
  • You use one teeny tiny drop of Americolor gel food coloring to get these vibrant colors. To get a vibrant color with liquid food coloring you may have to add up to a teaspoon of coloring (which I do NOT recommend). The color may still not be as vibrant and adding that much liquid will change the consistency of the dough.
  • I am including the links to the basic color pack and the “electric” colors. I use both sets in my kitchen. To see some more colors check out my Rainbow Chocolate Chip Cookies.

Items used in this recipe:

This post contains affiliate links