I need recipes for an 11 by 15 inch sheet pan, for both vanilla and chocolate cake. Normally I would just make several batches and fill the pan til it looks about right, but is there a specific recipe for these 2 flavors that has been altered to fit that particular size pan, bake times included? I've been looking through my recipe books and recipes on here but I can't seem to find what I'm looking for! Not sure if this is a stupid question with an obvious answer but any help would be appreciated!! Thank you!!!!

Double your recipe or use two cake mixes.
http://www.wilton.com/cakes/making-cakes/baking-wedding-cake-2-inch-pans.cfm