Funfetti Sheet Cake with Vanilla Buttercream
A bright, tender vanilla sheet cake loaded with rainbow sprinkles and topped with a cloud of sweet vanilla frosting. This dairy-free, egg-free version is every bit as fun and nostalgic as the classic, baking up in a single 9×13 pan with a soft crumb that holds up beautifully under a thick swirl of buttercream. Perfect for birthdays, celebrations, or any time you need a cake that feeds a crowd and makes everyone smile. The frosting sets just firm enough to write a message on top, and the whole thing comes together without fuss.