Give this Instagram-worthy rainbow layer cake a try and surprise your loved ones with its yummy taste and cute looks! Featuring red, orange, yellow, green, blue, and purple gel food coloring layers of vanilla sponge cake garnished with drool-worthy frosting, this rainbow layer cake is as fun to prepare as it is easy. Don’t skip this recipe and get ready to bring a little joy into your kitchen with the most delicious rainbow layer cake ever!