Just wondering if anyone bakes their pans close together in the oven successfully? The 12 inch square I need to bake and the 9 by 13 just fit with maybe a half inch on either side of both pans. The only thing I've read is that the cakes may shrink more, but it would be nice to save some time and make all my batter at once. Is it worth putting them in at once?

Good question! I would also like to know.

I have not had good luck with that. I have tried baking 2 12/cupcake pans at the same time on the same shelf and the oven seemed to not keep the correct temperature and they were overbaked irregularly. I am thinking that more air needs to circulate around the pans. I don't bake different capacity pans at the same time either since they will be done at different rates. About the only pans I bake two of are my 8 and 6 inch rounds. Probably ovens are different amd some may work. Mine doesn't