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Melted Rainbow Cake

Hungry Happenings Recipe by

Mimicking the effect of melting crayons, a rainbow of colored ganache is dripping down the sides of a bright white cake. Cut into the cake to find specks of rainbow colors as well.

(15 comments)
  • Prep Time 2 hr 0 min
  • Total Time 5 hr 0 min
  • Servings 20

A cake literally overflowing with rainbow colors!  

As prepared by Hungry Happenings

Bright, colorful ganache is poured over to create a cake drenched in a fun melting rainbow. 

Melting crayon artwork is a hot trend right now. When I saw a beautiful cake created by Shelly at Cookies & Cups using a rainbow of colorful white chocolate ganache dripping down the sides of a round cake, I knew I wanted to make it for a friend's upcoming birthday party. She loves rainbows and coloring with her kids was one of her favorite pastimes when they were young, so it's perfect! 

I needed a lot of cake for her party and wanted the entire rainbow of colorful ganache to show really well, so I chose to make a very large rectangle cake. I used Betty Crocker's Party Rainbow Chip Cake Mix so the inside of my cake was colorful too. My friend also loves frosting (especially Betty Crocker's Whipped White Frosting) so I created four cake layers and added frosting in between each. 

To make the colored ganache I used super white confectionery coating instead of white chocolate because I really wanted vibrant colors. White chocolate is cream-colored (not white), so the pink and red would look a bit orange and the blue a bit green if I used it. But either works well, so just use what you can easily find. You can purchase the super white or bright white confectionery coating at craft stores. 


Melted Rainbow Cake

You're going to need a 16x4x4.5-inch loaf pan to bake your cakes. I find it easiest to line my pans with non-stick tin foil. The cakes come out of the pan with ease, and clean up is a snap. Alternatively, you can grease it with shortening and dust with flour, or use non-stick cooking spray.

Once your pan is ready, whip up one of your cake mixes. 


Melted Rainbow Cake

Pour the batter into the pan. Tap the pan on the table a few times to remove any big air bubbles. 


Melted Rainbow Cake

Bake the first cake, and then let it cool for 10 minutes. If you've lined your pan with foil, you can now pop the cake out of the pan easily then rinse the pan in cold water to cool it off and prep it again for the next cake. I was actually able to peel the foil off the warm cake, wipe it clean and use it again for my next cake. Make another cake mix and bake it as you did for the first cake. 


Melted Rainbow Cake

Once your cakes are cooled, cut off the mounded top and cut each cake into two layers. 


Melted Rainbow Cake

Cut a cake cardboard into a rectangle that's just about 1/4-inch bigger on all sides than your cake. Set one cake layer on the board. Spread frosting over the layer, set another cake on top and repeat until you have all four layers stacked. 


Melted Rainbow Cake

Frost the entire cake and smooth it out as best you can. I find it easiest to freeze my cakes before frosting, and then freeze them again for a while until the frosting hardens a bit. I then run a damp paper towel over the cake to remove any ridges in the frosting. 


Melted Rainbow Cake

If you froze the cake, allow it to come to room temperature before the next step. You don't want a cold cake when you drizzle on the colored ganache or it won’t drip nicely. 


Melted Rainbow Cake

There are several ways to make the ganache for your cake, but using the microwave is the easiest. Just stir together the chopped white confectionary coating (or white chocolate), heavy whipping cream and corn syrup and zap it in the microwave on high for 30 seconds. Get it out and stir it then zap it again for 20 seconds. Let it sit in the microwave for a minute or so before removing it and stirring. If all the confectionary coating or white chocolate isn't melted, then heat it for 10-second increments until it is melted. 


Melted Rainbow Cake

Divide the ganache into 7 little bowls and add food coloring to make a rainbow of colors. 


Melted Rainbow Cake

Now the fun part! Set the cake up on two frosting tubs. Set that over some parchment or wax paper. That will catch all the colorful drips. Start at one end of the cake and pour a spoonful of purple ganache over the top edge, allowing it to dribble down the sides. Add blue next, then green. You can use a spoon to swirl the ganache colors on top of the cake if you like. The finished cake will look fun with swirled colors or solid colors. Either way is fine. 


Melted Rainbow Cake

Continue down the edge of the cake with yellow, orange, red, then pink. Then begin the color scheme again, going around the entire cake. 


Melted Rainbow Cake


Melted Rainbow Cake

Allow the colored ganache time to dry before you pick up the cake and put it on platter.


Melted Rainbow Cake

Enjoy!

See Recipe

Melted Rainbow Cake

Ingredients

2
Betty Crocker Party Rainbow Chip Cake Mixes
eggs,
water, and oil called for on cake mix
4
tubs Betty Crocker Whipped White Frosting
5
ounces white chocolate, or bright white or super white confectionery coating, finely chopped
1/3
cup heavy whipping cream
2
tablespoons corn syrup
candy
coloring - purple, blue, green, yellow, orange, red, pink

Directions

  • 1 Preheat oven to 325 degrees Fahrenheit.
  • 2 Line a 16x4x4.5-inch loaf pan with non-stick tin foil or grease it with shortening and dust it with flour.
  • 3 Make one cake mix according to package instructions.
  • 4 Pour batter into prepared pan.
  • 5 Bake for 48-52 minutes until a toothpick inserted in the center of the cake comes out clean.
  • 6 Cool cake for 10 minutes. Remove from pan and cool on a wire rack.
  • 7 Clean and rinse pan with cold water and make the second cake as above.
  • 8 Once both cakes have cooled, cut off the mounded top, and cut each cake into 2 layers.
  • 9 Frost in between layers and around the cake.
  • 10 Prepare the ganache by mixing together the chopped white confectionary (or white chocolate), heavy whipping cream, and corn syrup.
  • 11 Heat in the microwave on high for 30 seconds. Stir. Heat for 20 seconds, then let set in microwave for 1 minute. Stir. If not all the confectionary or chocolate is melted, heat for 10 second increments, stirring after each.
  • 12 Divide ganache into 7 bowls. Color each bowl of ganache using candy coloring creating a purple, blue, green, yellow, orange and pink.
  • 13 Start at one end of cake and pour a spoonful of purple ganache over the top edge allowing it to drip down the sides of the cake.
  • 14 Next to the purple add a spoonful of blue, then green, yellow, orange, red, then pink, repeating this as you go around the entire cake. If desired, swirl the colors on the top of the cake. If the ganache becomes too thick, heat it in the microwave for about 10 seconds to thin it out.
  • 15 When ready to serve, cut into 20 slices.
See Post

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