Paleo, Vegan, whatever tickles your pickle- the ingredients can easily be adjusted to fit your needs!
Set oven to 350. Generously grease four 6 inch round baking pans.
Pour apple cider vinegar in almond or coocnut milk and set aside.
In your electric mixer, blend the oil, vanilla extract and sugar until creamy. Add eggs one at a time and continue to blend until somewhat fluffy.
In a separate bowl, whisk the flour and baking soda.
Start to slowly add the dry mix to your wet mix. Alternate with the "buttermilk". It will come out to about 3 pours of the dry mix and two of the milk.
Once batter is well mixed, pour evenly across the 4 cake pans.
For the rainbow effect, add a different color to each pan until your desired vibrancy is reached. I would highly recommend going as dark as humanly possible. When you are using all natural food coloring, much of the color bakes out. This is the coloring that I used and I had to add an entire bottle to each cake pan.
Bake for approximately 15-20 minutes. Ovens will vary. Keep a close eye on it and throw a toothpick in the center at the end, just to be sure.
Once cakes have been removed from the oven and are finally cool, take a cake leveler and scrape off the top so they are more easily stackable.
In a saucepan over low heat, bring butter, sugar, and milk to a boil for about 2 minutes.
Continue to stir while boiling.
Transfer to a large bowl and add vanilla.
While electric mixture is running, slowly add in the confectionary sugar until desired texure is reached. Those of you who like more of a "wet" frosting will opt for closer to 3 cups and those who like more of a fondant texture will go closer to 4. Just make sure you ice the cake quickly as this frosting sets fast!!
If you prefer to dye your frosting, go for it. Otherwise, start spreading the frosting across the top of each cake layer and carefully add the next layer on top.
Once the cake is stacked to your liking, add the remainder of the frosting and spread across the top and sides of the cake. Add organic sprinkles and voila! You have yourself one of the cleanest cakes around.