I need something that is quick and relatively inexpensive. A couple of boxes of cake mix, oil, eggs, etc. with a quick mix method of dumping it in all in one bowl, mixing it, and then pour it in a pan. This has to be ready at 8 am and I so, hence the need for something quick. This does not count cooling, icing, and decorating. I am doing a sheet cake to expedite the time factor.