Easy Rainbow Cake! (with cake mix & frosting!)

You don't need any fancy baking skills or experience to make an easy rainbow cake using cake mix- the quick and simple version of  the infamous rainbow cake that Kaitlin from Whisk Kid created and blogged about, then shared on the Martha Stewart show!
(This photo is of my version)

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Her cake is beautiful & as soon as I saw it, I wanted to try it. I tried it for a family gathering for my 3 year old's birthday and I wanted to do it the quicker and easier way. So, today my friends, I'm going to share with you the easiest way to recreate the rainbow cake with cake mix and store-bought frosting.

How to Make a Rainbow Layer Cake

Here's what you'll need:

(I only used 3 of those frosting containers for mine)

Easy Rainbow Cake Recipe

1. Start by making the cake mixes as directed on the box (use WHITE cake mix- not yellow, and only egg whites or the colours of the cake won't turn out as well).

2. Divide the batter into 6 bowls & add food colouring in your desired colours.

3. Bake in round, lined cake pans (watch carefully since they are smaller than the mix expects, and will be finished sooner).

4. Take each cake out of its pan & let cool. Then wrap and put in the freezer. (I did mine overnight just because that's what time I made mine, but you only need to leave it long enough that the layers are easier to work with than soft cake)

5. Plop the first layer of cake on your place (icing underneath will "glue" it in place) and frost the top of it, then add your next layer of cake, frost the top, add the next layer, etc. until your colorful layer cake is all assembled like so:



6. Finish frosting the outside of the cake (be generous with your frosting between layers & on the outside, to prevent crumbs showing through on the outside, and to make it look cooler when you cut it ;)



You can leave it plain or add decoration to it. Here's what I did with mine:



And here's what the slices look like:

Easy Rainbow Cake

Isn't it pretty? :) I was so happy with the way it turned out! Someday I'd love to make Kaitlin's deluxe version, but for this occasion, the store-bought mixes & frostings did the trick!

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If you're looking for other rainbow ideas, there are a bunch in my St. Patrick's Day Ideas Roundup!