Rainbow Ganache Cake

Welcome to post 2 in Valentine’s week here and at Confessions of a Cookbook Queen!

I guess this cake isn’t really Valentinesey…

But it totally could be…I mean, just use red and pink ganache…

The idea for this cake came from all those cute Melted Crayon Art projects all over Pinterest.  Have you seen those?  SO fun!



And even though rainbows aren’t your typical Valentine’s symbol I’m thinking that no one would be UPSET if a rainbow happened on Valentine’s Day.

Rainbows are basically love in the sky, so I think this totally makes sense.


Rainbow Ganache Cake

Rainbow Ganache Cake | Cookies and CupsThis cake is pretty darn easy…I mean as far as cakes go.

I am by no means an expert cake decorator…as a matter of fact I have grown to moderately despise cake decorating.

After one too many disasters, I decided my patience level in not suited for cake artistry.  I am more of a slap it together kind of girl.


So this cake is perfect for me…simple frosting, drippy ganache, and swirled colors.  Basically you can’t mess it up…

Just bake your cake.

I made chocolate…but I am sure there are you girls out there who would take this whole cake to the next level with a swirled cake inside, or a rainbow layer cake.  Go for it.

I “crumb coated” the cake…which is a thin layer of frosting that you smooth on first and let set.  It just prevents you from getting cake crumbs in your final product.  It seals in all the crumbs.

Then I went over the crumb coated layer with a a smooth layer.

I used my recipe for buttercream.

PhotobucketAfter you’ve frosted the cake, go ahead and make your white chocolate ganache.

Just chop up some white chocolate fairly finely…

PhotobucketNow place your chopped white chocolate in a bowl and pour some nearly boiling heavy cream on top.

Stir the cream and white chocolate together until it melts.  If you need to, you can microwave it slightly so all the white chocolate melts.

PhotobucketNext add some light corn syrup to the ganache.  This helps give it a little shine.

Then separate your ganache into bowls in equal proportions…the amount depends on how many colors you are using.

PhotobucketI used Candy Coloring to tint the ganache…with the white chocolate in there, I was worried that regular food coloring wouldn’t work.

PhotobucketI just added a little bit until I got the colors that I wanted.

PhotobucketThen start with one color at a time.  Place a nice spoonful in the center of the cake and using an off-set spatula, or large spoon push the ganache to the edge, letting it drip down the sides itself.

PhotobucketContinue around the cake cake alternating colors…

Rainbow Ganache Cake | Cookies and Cups


White Chocolate Ganache
  • 4 oz white chocolate, chopped finely
  • ¼ cup heavy cream
  • 3 Tbsp light corn syrup
  • candy coloring
  1. Chop your white chocolate and place it in a medium sized bowl.
  2. Heat heavy cream in microwave about 1 minute until it's very hot.
  3. Pour the heavy cream over the white chocolate and let it sit until the chocolate melts, stirring often.
  4. If the white chocolate doesn't fully melt microwave for an additional 20 seconds until melted.
  5. Add in corn syrup and stir until incorporated.
  6. Place mixture in the refrigerator for approximately 10 minutes until cooled.
  7. When chilled, separate into bowls and add color to each.
  8. Pour over top of the cake, pushing to edge allowing ganache to drip down over the side of the cake.



Now go check out the Chocolate Cherry Push Pops at Confessions of a Cookbook Queen!



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50 Comments on "Rainbow Ganache Cake"

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bridget {bake at 350}

That cake is SO creative! Rainbow ganache!!! How cool is that?!?

jersey girl

I’m a firm believer in easy is often better. This looks great! I just may try this for my MIL’s upcoming birthday right before V-day.

Marie M.C.

Your right! Easy is always better. LOVE this cake. Gotta try it. Never heard of the special colors to use with white chocolate. That’s why I love you and Kristan — I’m always learning something new and it looks easy enough for clumsy ol’ me can do it! Well, at least I’m not too intimidated to try.


What a clever idea! A work of art. And edible too – my favourite kind 😉


What a cute and creative idea! Love it!! 🙂


Wow, that looks super pretty! I’m a bit uncoordinated when it comes to cake decorating, so this technique might come in handy the next time I want an impressive cake that I actually have a hope of pulling off!


Awesome! I have a joint baby shower coming u with different gender babies. This will be awesome! Now the question is pink & blue or green & purple?


Blue & Pink!! I was just dreaming of the possibilities of this cake! One of the first things that came to mind was a blue & pink cake for a babyshower!!!!

Brian @ A Thought For Food

Ok this is pretty freakin’ cool! It came out incredibly well!


How cool! This is beautiful!

Liz @ Tip Top Shape

It’s like a dessert and art project in one! Love it!!

Alison @ Ingredients, Inc.

so clever and FUN

Colleen @ What

Beautiful! I love this idea!!

tracy {pale yellow}

This is an incredibly beautiful and creative cake! Awesome work Shelly, I’m super impressed!

Katrina @ Warm Vanilla Sugar

Oh my! I love this artsy cake! Pretty!


that is just spectacular!
Very creative!


There is something about rainbows that screams LOVE though I can’t quite put my finger on it. What a cute cake idea!

Janel Gradowski

My daughter would go crazy for this. Not only does she love white chocolate, she is a tie-dye fanatic. This might just be her birthday cake this year!

Glory/ Glorious Treats

So cool! At first glance, the first thing it reminded me of was the melted crayon projects! Really fun and creative idea!

Stephanie @ Eat. Drink. Love.

This is a work of art!! love it.

Sylvie @ Gourmande in the Kitchen

What a fun idea! It really does looks like melted crayons.

Caroline @ chocolate & carrots

This is so cool Shelly! I bet it would be the star of a 70’s themed party too! I love the thought of making it valentines-y too! 😀

Nikki @Pennies on a Platter

Beautiful! By the way, I would totally make a chocolate cake, too. Not only to keep it simple, but because it’s the flavor I LOVE. I was thinking, you could probably use this same concept of colors with King Cake…but as a layered cake like this and colored sugars instead of icing. Hmmm…. might be a little project for me next week. 🙂


What a FUN idea! My kids would love pouring the color over the cake. 🙂

Amber | Bluebonnets & Brownies

Such a great idea, Shelly! I love how they swirl together.

Kelli @ The Corner Kitchen

Wow, this is such a fun cake!! Love the idea!

Annie @ Annie

Oh wow, this cake is beautiful!

Kiersten @ Oh My Veggies

Okay, this is totally doable and I didn’t think it would be. At all. And so pretty too!

Sue {munchkin munchies}

You must have been so happy when it turned out so beautifully! Love it!

Diane {Created by Diane}

Super-fun cake! I love rainbows 🙂


Just a beautiful and happy cake.

Erin @ The Spiffy Cookie

This is awesome! Love the inspiration from the melted crayons

Erin @ Dinners, Dishes, and Desserts

What a fun idea! I have never done much rainbow stuff, this is awesome!


WoW! Sooooo cool! The possibilities are endless! Pink & Blue for baby shower…. Red & Green for Christmas… Pink & Red for V-Day……….. AWESOME IDEA!! I cant wait to experiment! Thanks a million!!!



Aya B.

What an amazing idea
So talented 🙂

Annie @ Annie

So pretty! I’ve been wanting to have a go at cake decorating and I deffiinntelly need to start easy. This is one of those recipes that looks beautiful but is deceivingly simple. And so many ways to customize the colors!


This is amazing! So creative! I am the worst at cake decorating, but perhaps even I could make this happen?…will need to try…


What a fun twist on rainbow cakes!

Lori @ RecipeGirl

This is so super cool!!! Loved your video w/ Kristan!


This is s beautiful and I love how simple it is!


Just wanted to let you know that your cake turned out beautifully! I had never considered making a multicoloured ganache before this moment. For a good friend’s birthday this year, I am going to surprise them with this cake as a Rainbow Dash cake. Instead of a chocolate base, though, it will be a sky blue base. The bronies are going to love it!


OMG I am just now seeing this…. Ahmazzzzzing miss … love it!!!!


Made this delicious cake yesterday and followed all your instructions for the ganache. It was a big hit. I used regular food coloring and the colors worked out great. Thanks.


I’m totally envisioning this as a St Patrick’s Day dessert and sprinkling gold coins all around the bottom of the rainbow ganache drippings!

Soooo Cute!


thanks for sharing this great idea! will be trying it out very soon!


That looks amazing! -I was wondering if it would be possible to substitute the corn cyrup for something else, as I can’t find it where I live…?

replica michael kors

JUST AWESOME!!!!!!Gr888 Job http://youtu.be/CxZRvoeDQas


I want to make this for my daughters birthday, but is there anything I can use for the ganache other than chocolate. My husband won’t eat it.