A Journey to Vegan · Vegan in Boston

Vegan Rainbow Cake in a Jar

I made vegan rainbow cake in a jar last week. Not only did it look cool, but it tasted amazing!


I know, I’m supposed to be off sugar, but it was one of my good friend’s birthday so I had to make an exception. Plus, I had PMS and the cure for that is sugar, right?


Here’s the recipe I used: http://speedbumpkitchen.com/rainbow-suprise-cake/


Now, the problem is this recipe is for making a layered rainbow cake and not for making rainbow cake in a jar so I had to modify it to make it work:

  1. I separated the cake filling into 6 separate bowls, half a cup of filling in each.


2. Then I mixed in a different food coloring in each. I used Wilton’s gel food coloring as it apparently is vegan!


3. Then I added a tablespoon of each colored filling into each jar (these are adorable 8 ounce mason jars, bought here). I tilted the jar to make sure some of each of the fillings of different colors touched the edges of the jar. A tablespoon of liquid is not a lot but when it rises it will be! You might want to preheat the oven (350 degrees) when you are on the last color.

4. I put the jars in a cupcake tin and baked for 30-35 minutes at 350 degrees.


They came out looking like this, much expanded and with darker colors. Perhaps if I added less food coloring to the cake it would have come out lighter? I know that baking makes colors appear dull so it might be inevitable.

I froze them for a day, then made (half) the vegan buttercream frosting, put it on top of the cake and added some gold glitter!


The actual bites of cake looked really cool, the colors more vibrant than they appear from just looking at the jars:



Thoughts: Is it possible to make colors look more vibrant when they are baked? Also, the red and the orange were such similar colors, if I added less food coloring to the orange perhaps it would show up better? The blue had the same problem with the green and purple.

Were I to have cut off just before the cake expanded in the jar, the “rainbow” would look a lot cleaner…there would also be a lot more room for frosting. Personally, I thought it had the perfect amount of frosting and wouldn’t want to needlessly trow away cake.

In any case, I am very pleased with how it turned out.

Any experienced bakers have any tips?



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7 thoughts on “Vegan Rainbow Cake in a Jar

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