I get so excited when I spot a rainbow!  It doesn’t 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.



My special guest, Tiffany Pratt, will make this even more fun!



Where Do I Buy My Ingredients & Tools??

I'm not going to tell you where to buy all of my ingredients for this recipe. I want you to go out there and have fun at the candy store picking out all those rainbow coloured candies! But I will tell you where you can find a few key items on my Parsel page right here


Baking Your Vanilla Rainbow Cakes!

Ingredients & Tools You Will Need:

6 lb portion of Yo’s Ultimate Vanilla Cake - find my recipe here

Rubber Spatula

14 x 4” Round Cake Pans, lined with parchment paper

Wilton Christmas Red Yellow Icing Colours

Wilton Orange Icing Colours

Wilton Lemon Yellow Colours

Wilton Leaf Green Icing Colours

Wilton Sky Blue Icing Colours

Wilton Violet Purple Icing Colours

Wilton Pink Icing Colours



Once your batter is prepared, divide it evenly into 7 bowls (about 14 oz of batter per bowl).  Dye each portion of batter one colour of the rainbow.  You want all the colours to remain bright and fun.

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






Filling Your Rainbow Cakes!  

Ingredients & Tools You Will Need:

Simple Syrup - find my recipe here

Italian Meringue Buttercream - find my recipe here

2 cups Sprinkles


Serrated Knife

1 1/2” Circle Cutter

Piping Bag

#806 Round Tip

Small Offset Spatula

Small Icing Spatula

Measuring Spoon

Bench Scraper



Remove your cakes from their pans, level them and cut each one 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. 



Shower all the layers of your cakes with simple syrup.



To fill each cake, place one full layer down and spread on a layer of buttercream.  Place a cake layer, with a hole cut out, on top.  Use your piping bag to pipe a ring of buttercream on top of the cake and spread it evenly with your offset spatula.




Place the second cake layer with a hole cut out on top.  Use your small icing spatula to ice away the excess buttercream from within the walls of the hole.  Fill this secret chamber with rainbow sprinkles.  I used my souvenir mini candy scoop from a trip to Dylan’s Candy Bar. I knew it would come in handy! But a measuring spoon will do the trick too. Make sure the secret chamber is filled all the way to the top so that the sprinkles are flush with the cake.

Flip the final layer of your cake over and spread on a layer of buttercream.  Now invert that top layer onto your cake with the buttercream facing down.




Now just repeat this process with the remaining 6 colours of cake!

Give your cakes a crumb coat and chill them for 20 minutes. 

Once your cake are chilled properly, ice them smoothly and chill them again.  I like to use a bench scraper because I find it really helpful and effective.





Covering Your Rainbow Cakes in Fondant!

Ingredients & Tools You Will Need:

2 1/2 lbs White Fondant

Icing Sugar

Rolling Pin

Fondant Smoother

Paring Knife


A word to the wise- before covering your rainbow cakes make a mark on the bottom of the board to label the colour.  Once they are all white, you won’t be able to tell.  I remembered that just in the nick of time!

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.  Remember to knead all your scraps well and reuse them.




My fondant was cracking around the top edge of some of my cakes.  I chilled them and patch the cracks with some royal icing. You can also patch a crack my watering down a little piece of fondant to make a paste.



Decorating Your Rainbow Cakes! 

Ingredients & Tools I Used (But You Can Sub In Your Faves!):

Chocolate Buttons

Coloured Sugar



Jumbo Gumballs

Sour Warheads

Banana Candies

Rock Candy Sticks

Royal Icing Flowers

Food Writer Markers

Food Grade Alcohol

White Food Colouring

Paint Brushes

Royal Icing - find my recipe here

Clear Piping Gel



As usual, I headed to my local bulk store to pick up candy in all the rainbow colours.  I always have fun doing this. 

These cakes are all about fun.  Set up a cake decorating station, invite your friends over or decorate with your kids.  These mini Rainbow Cakes are all about using your imagination.



I had a blast with Tiffany Pratt!  In fact, she’s pretty much a living rainbow!


Use the same gel food colouring you did to dye your cake batter to paint your cakes.  You can 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.  Be one with the cakes! The possibilities are endless.

These are the perfect little cakes for any celebration.  Who doesn’t love a rainbow?