I'm making a cake for a child's birthday this weekend. Unfortunately the mother of the child (who happens to be my boss) is unsure how many people will be coming to the party. While she's expecting only 10 children to attend, when you count their parents as well as any stray children that might join in at the last moment, she's decided she'd like me to make a cake to serve 25 people. I'm planning on making a cake using a 13x9x2 pan, and had the idea of doubling a recipe for a cake of this size, and making a two layer (or possibly four layer if I cut each cake in half horizontally, creating two layers from each single layer) cake. Will this feed the group? I'm pretty sure this is equal to a quarter sheet cake, which should definitely feed a group of 25, especially when half of that group is children. Do you all agree?
Also, since I know a single 13x9x2 layer is equivalent to two 9 inch round layers, I was going to take a recipe that yields the two 9 inch rounds and double that, in order to get two 13x9x2...does this seem appropriate? Does anyone have a phenomenal recipe for a vanilla cake that they've both baked in a 13x9x2 pan and enjoyed? I have a pretty trusty cake recipe that I plan to use (from the Whimsical Bakehouse cookbook), but have never baked it in a pan of this size and thus am a bit concerned with baking times and texture, so would love to find a recipe that is tried and true in this size pan. Keep in mind that this is for the discriminating palate of a 5 year old, meaning basic flavors are definitely best.
Thanks in advance!