i am doing my first graduation cake i have been reading almost all the posts and i dont know if i should do just 1 layer or a 2 layer sheet cake??? it will be feeding about 30 people. i know the designs and everything i want but im totally inexperienced... 
can anyone offer suggestions????? 
i would greatly appreciate it 
thank u very much you two . i really appreciate it 
I feel really dumb asking this question but here goes... How can you get more servings just by adding an additional layer on top. It is still the same measurement
If you would have a single layer and cut it into, say a 2 inch wide square serving, it would be 2 inches tall (in a 2-inch tall pan). If you were to have a double layer, it would be 4 inches tall and you could cut it thinner (1-inch square). Does that make sense?
We're not talking about torting a single layer. It's like having 2 separate cakes stacked on top of each other which would serve as much as two singles.
Thanks marknrox I understand now. When you cut the cake it will be thinner sliced because it is doubled. Never thought about this method 
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