Rainbow Cakes

How To Cake It's profile picture
  • Difficulty Level: Beginner
  • Occasions: Birthday, Everyday, Summer Party, Pride, Kids Party
  • Feeds: 7 mini cakes

I get so excited when I spot a rainbow!  It doesnt happen often but rainbows feel magical. They make me feel like a kid again.

I started to imagine how I could cake my very own rainbow.  I am making 7 mini cakes, each one representing a colour of the rainbow.  The cakes will be full of colour from the inside out, topped with some of my favourite candies, and filled with a rainbow surprise.  This is going to be fun.

When I got the chance to decorate these rainbow cakes with my special guest, Tiffany Pratt, it was even more fun!

ingredients image squiggle



  • 6 lb portion of Yo's Ultimate Vanilla Cake


  • Simple Syrup
  • Italian Meringue Buttercream


  • 2 1/2 lbs White Fondant
  • Icing Sugar & Colored Sugar
  • Chocolate Buttons
  • Sprinkles
  • Gumballs & Jumbo Gumballs
  • Sour Warheads
  • Banana Candies
  • Rock Candy Sticks
  • Royal Icing Flowers
  • Food Writer Markers
  • White Food Colouring
  • Royal Icing
  • Clear Piping Gel
  • Gel food coloring: red, yellow, orange, green, blue, purple, pink
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Learn More About Yo's Rainbow Mini Cakes!

Watch It!

  • Prepare the 6lb portion of Yos Ultimate Vanilla Cake. Divide evenly into 7 bowls (about 14 oz of batter per bowl). Dye each portion one colour of the rainbow.

  • Divide all of the coloured batter between your 14 prepared cake pans.  Two cake pans per colour.  Bake the cakes at 350 for 35-40 minutes, or until a toothpick inserted in the centre comes out clean. Let cool.

  • Remove the cakes from their pans, levelling them, and cutting each into two layers. Each coloured cake will be made up of four layers.

  • Using the 1 1/2 circle cutter, cut a hole from the centre of the two middle cake layers in each colour.

  • Prepare the simple syrup and soak all the cake layers.

  • Prepare the Italian Meringue Buttercream. To fill each cake, place one cake layer down and spread on a layer of buttercream. Then place a cake layer, with a hole cut out, on top. Use a piping bag to pipe a ring of buttercream on top of the cake and spreading it with an offset spatula.

  • Place the second cake layer with a hole cut out on top. Fill this secret chamber with rainbow sprinkles, filling all the way to the top. Flip the final layer of cake over and spread a layer of buttercream, flip again and place onto the cake.

  • Repeat this process with the remaining 6 colours of cake. Once completed, crumb coat and chill for 20 minutes.

  • Ice them smoothly, and chill again.

  • Make a mark on the bottom of the cake board to label the colour. Once they are all white, you wont be able to tell.

  • Cover each cake with fondant. I rolled out 3/4 lb at a time, and had 1/2 lb left over once the cake was covered.

  • Set up a cake decorating station, invite your friends over or decorate with your kids.

  • Paint your cakes using the same gel food colouring that was used to dye them. Dilute it with food grade alcohol or white food colouring to make it more opaque.

  • Draw on the cakes with food colouring markers. Glue candy all around with the help of royal icing. Brush on a base of clear piping gel and throw on some sprinkle and sugar.

Congratulations you did it!

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