The smiley, happy, silly rainbows on this cake are totally inspired by those amazing frosting covered sugar cookies you get at the bakery. Or at least, at the grocery store bakery that I would frequent in my youth.

Those cookies were the only thing that made shopping trips tolerable for my mother when I was young. The promise of just one of those delectable cookies was enough to exhilarate my senses and make me… well… behave.

Its funny how sugar still triggers that emotional response in me today!

Anywho… here are some over the top, crazy, supposed to make your heart happy rainbows.

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All of those rainbows are pure sugar highs… courtesy of my favorite buttercream recipe of all time.

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Since this is a St. Patrick’s Day cake I actually made hundreds of gold coins for the base of the rainbows. I just made my homemade sprinkles, only bigger. But since I made them bigger they were taking forever to dry and I got impatient.

Hence, fluffy frosting clouds.

Next year I will plan better.

I mean, I probably wont, but I can pretend.

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And then, because it seems to be physically impossible for me to make a cake without a surprise inside, I decided to add a shamrock.

Seriously… I made so many impulsive choices on this cake! I dont know what I was thinking.

Like instead of a bright green jolly shamrock, mine is really, really dark. I thought it would be a fun to make Nigella’s Guiness chocolate cake (beer… St. Patrick’s Day… it seemed like a good idea) and then just add a little bit of green so it wouldn’t be IN YOUR FACE green.

Like with this St. Patty’s Day cake.

I will show you what I mean.

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Its dark.

And mostly resembles a shamrock.

At least it tastes fantastic!! (white cake recipe here)

This was one TOUGH cake. I really dont think a tutorial is possible because I need a full year to forget how much work it was.

Sorta like having a baby. Which I will be doing in 17 days. (scheduled C-Section)

TMI for a baking blog???

Sorry. 🙂

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Meet Amanda Rettke

Amanda Rettke is the creator of I Am Baker, and the bestselling author of Surprise Inside Cakes: Amazing Cakes for Every Occasion – With a Little Something Extra Inside.Over the course of her 15+ year blogging adventure, she has been featured in and collaborated with the Food Network, New York Times, LA Times, Country Living Magazine, People Magazine, Epicurious, Brides, Romantic Homes, life:beautiful, Publishers Weekly, The Daily Mail, Star Tribune, The Globe and Mail, DailyCandy, YumSugar, The Knot, The Kitchn, and Parade, to name a few.

Reader Comments

  1. I’m so amazed by all of your cakes with pretty designs on the inside. This one is especially amazing! 🙂

  2. This is such an amazing cake! I love your idea of using Nigella’s recipe, and hiding the shamrock inside. You are insanely creative, as always. Thanks for sharing with us.

  3. 17 days! can’t you wait until april 8th? it’s the birthday of someone pretty terrific, if she does say so herself. 🙂
    masterful work on this one, amanda–it makes me think of the care bears for some reason. 🙂

  4. I die. I DIE! This CAKE is beyond my DREAMS!!!!!
    True story: when I was a little kid I wanted a cake with a rainbow on it REALLLLY badly. The cake I was served had a “rainbow” with random colors that were out of order. I was Very disappointed. THIS was the Cake of my Childhood dreams!!! Realized like, 24 years later!
    You are so incredibly talented and your blog entries are such a gift!

  5. Once again you’ve outdone yourself !!!
    Mon dieu :O) you’re awesome.
    17 days? that happened fast…hihihi…. apologies :O)… at least from my side of the screen.

  6. I love, love, love the rainbows and clouds on this cake. It reminds me of the 3/4-length baseball shirt I had as a kid, with a glittery rainbow iron-on, and the letters of my name ironed on down my sleeve. 🙂 And I’m not going to even ask HOW IN THE WORLD you made that shamrock. Now THAT would be TMI!!!!!

  7. I was actually going to attempt something like this, since when I made your heart cake for valentines day, it was a huge hit and the bf’s work! Although, with two days to go, might skip it this year and just make them a reg cake with an ices St Patty’s day theme. There’s always Easter!
    Thanks for the always inspiring posts 🙂 You’re an amazing baker, and good luck with the C-section!

  8. HOW DID YOU DO THAT?!! THIS IS AMAZING! I was first ‘wow’ed by your rainbow frosting , then I scrolled down,the inside beauty just blew me off! great job!

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