Rainbow Cake

by Jen on April 27, 2010

This Rainbow Cake was probably one of the best birthday cakes I have ever tasted. It was moist, colourful, and absolutely delicious! Plus, you’ll impress everyone at the party!

It is really easy to make, just a little time consuming. I baked for 5 hours because I made 2 of these cakes for fear that one wouldn’t be enough to feed 17 people. However, one cake was just enough! The other one is in the freezer for another celebration.

Each layer has it’s own fruity flavour as there is real fruit baked right in. This website was my inspiration.


2 boxes white cake mix (I used Betty Crocker)
6 eggs
1 cup water
2/3 cup vegetable oil
zest of 1 orange + juice of the orange
zest of 1 lemon + juice of the lemon
zest of 1 lime + juice of the lime
1/2 cup fresh or frozen raspberries, mashed
1/2 cup fresh or frozen blueberries, mashed
1/2 cup fresh or frozen blackberries, mashed
Wilton’s gel icing colours in red, orange, yellow, green, blue, and purple (I bought mine at Michael’s)

6 bowls
6 disposable 8″ round foil cake pans


Make the batter for the cake as directed using the 6 eggs, 1 cup water and 2/3 cup vegetable oil. Scoop 1 cup of cake batter into each of the 6 bowls.

In the first bowl, mix raspberries and 1/4 tsp red colouring into the batter.
In the second bowl, mix blueberries and 1/4 tsp blue colouring.
In the third bowl, mix blackberries and 1/4 tsp purple food colouring.
In the fourth bowl, mix orange zest, juice, and 1/2 tsp orange colouring.
In the fifth bowl, mix lemon zest, juice, and 1/4 tsp yellow colouring.
In the sixth bowl, mix lime zest, juice, and 1/4 tsp green colouring.

Prepare the six 8″ cake pans by greasing and flouring each generously. Spoon and spread each colour of batter into it’s own cake pan.

Bake in oven, preheated to 350 degrees for approximately 20 minutes, or until tops spring back when touched lightly. Allow to cool completely.


1 cup butter, softened
2 – 8 0z. packages cream cheese, softened
8 cups confectioner’s sugar
2 tsp vanilla or lemon extract (I used vanilla)

Cream butter and cream cheese until smooth. Add sugar and extract. Beat on high speed until smooth, light and fluffy.

Put first layer of cake on a sturdy cake plate. Frost the top. Add second layer and frost the top. Add third layer and frost the top. I then put mine in the fridge for 1/2 hour to harden a bit so the cake wouldn’t move around when I added my next three layers. Then add next three layers, frosting each until last layer is on top. **I put my layers in the order of the rainbow colours**

Frost the entire cake. Refrigerate overnight.


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{ 19 comments… read them below or add one }

1 Mom vs. the boys April 27, 2010 at 8:04 pm

LOVE IT! I am so going to steal…I mean..borrow this for the boys' birthdays in June! I didn't realize there was fruit in it. Can you bake all 6 of those pans at the same time?


2 passionofthemom April 27, 2010 at 8:53 pm

This is THE coolest cake ever!!! =D I'm so making it for my 30th b-day…=) And my kiddo wants one, too, so I think it will be a repeat this year….hooray!


3 Pennie April 27, 2010 at 10:08 pm

You better believe I am printing this right now!!! I am going to make this for my family as a surprise SOON!!! No special birthday – just a surprise! (The next birthday in the family is mine…and that's not until August…who can wait that long???) Thanks!!!


4 Julie April 27, 2010 at 11:21 pm

I'm seriously considering making this one day. One day..is the key word there. I know my kids would just die of excitement if they cut into a cake like this. And…the real fruit might have just sealed the deal. I'll definitely inform you if I ever get up the nerve to try it!


5 DG at Diary of a Mad Bathroom April 28, 2010 at 1:01 am

OMG! AMAZING. Must make!


6 Laura April 28, 2010 at 2:39 am

So so so cool! You did an awesome job! I have seen this cake before but it didn't have the fruit in it which is obviously WAY better! 🙂


7 Arizona Mamma April 28, 2010 at 3:28 am

I remember when Mckmama posted this cake…but she didn't have the fruit added. Nice touch.

Maybe I should just pass my Tasty Tuesday torch to you.


8 Suzi April 28, 2010 at 2:52 pm

this cake it truly awesome. I want some, please send me your extra cake? pretty please?

Being a stickler for things like this I am so pleased you took the time to put the colours in the correct order!

I really, really, really, want to make this cake right now!


9 Mom vs. the boys April 28, 2010 at 3:41 pm

an odd little award for you over on my blog


10 Natalie April 28, 2010 at 8:51 pm

Hello! Thanks for visiting my blog 🙂
LOVE this cake idea!!! I have a niece that has a bday coming up and I think that this would be a cool surprise cake!


11 Shandal May 1, 2010 at 3:33 am

OMG that sounds SOOOO good with the fruit and the juices in it! YUMMY! Thank you SOOO much for sharing!


12 Dana May 12, 2010 at 2:42 pm

That is so cool!! I'm doing it this month!!


13 Playground Snoop June 11, 2011 at 10:09 pm

this is so much more fresh than I had expected. Looks awesome!


14 Maria Elena Hoover July 3, 2011 at 5:07 am

THANKS for sharing this, I had never seen this before and so LOVE the cake! I will definitely have to make it sometime for my nieces or just for fun 🙂


15 Tracy S January 12, 2012 at 7:00 am

so I made this last night, and I don’t know what happened, but my cakes were flat, no fluff at all?? I did the fruit additions, and used 1 cup of cake mix, but something went wrong and they didn’t fluff up? But we will still eat it anyway! 🙂


16 Jen January 12, 2012 at 8:11 am

Seems weird! The only reason a cake would be flat would be because of bad baking soda or baking powder…so maybe the cake mix was bad? At least you enjoyed it anyway 😉


17 Tracy S January 12, 2012 at 10:49 am

i know..very weird. But I did make your BBQ chicken salad last night and it was VERY tasty. I’m enjoying checking our your recipes. I just stumbled upon your website one day and I’m liking it. I also live in Canada. Ontario! 🙂


18 Jen January 12, 2012 at 11:06 am

So glad you are enjoying some of my recipes…eh 😉


19 Tracy S January 12, 2012 at 12:38 pm

I will forsure be trying that one you posted today with the roasted pepper salad! yumm!!!


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