Jenna Barnard on Instagram: "This recipe has been HIGHLY requested, so I'm very excited to finally share my funfetti sheet cake! Inspired by my popular funfetti layer cake, this sheet cake is even easier to make and just as soft, fluffy, and delicious. A few key ingredients help us achieve that classic birthday cake flavor, which basically tastes like rainbow and makes it the perfect cake for celebrating 🌈 full recipe is now up on my website!"