I know this might be a silly question, but when baking an 11x15 size sheet cake I want it to look high like the pictures I see in books, etc. Is this look acheived by baking two 11x15 cakes, filling them, and placing one on top of the other? Is that what a 2-layer 11x15 is? And if so, would you just use 2 cake boards to support the cakes? Any input would be greatly appreciated.
Two layers with filling would give you a taller cake. You would not need a board between the layers, but you would need to at least double the boards under that cake. If they bend, the icing/cake can crack.
you would have to bake two and stack them.