I want to make a slab rectangular cake for my sisters birthday and again for an Avon meeting coming up in March. I'm not going to be filling it or anything...but I just don't know how many box mixes I should use. The cake pan is 11 x 15. I would like a decent height to the cake but not to over-do it either I suppose. Maybe 2 boxes???
Also, when icing a slab cake like this, is there a need for cutting off the top or turning it upside down? Can I just frost it even if it does have a rounded top on it??? or would it look better flatter? Do you turn it upside down if you do cut the top off?
So many questions, so little time.... 
I use 2 mixes for 11x15 and bake it at 325. Once I pull the cake from the oven, I take a towel and press down on the cake (tip I found on cc and it works great for single layer cakes). Then, I flip it onto my cake board. I always turn my cakes upside down to ice.
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