I doubled the recipe to make a 12x17" sheet cake for my daughter's baby shower and it was wonderful. As others suggested, I did add a packet of instant coffee and used half regular cocoa and half dark cocoa. I saw the reviews that said it stuck to the bottom of the pan so I used cake release (look in the cake decorating section or a hobby store) and had no problems or the funny crusting that you get sometimes with the grease and flour sprays. I also stored it in the freezer for a couple of days to maintain/increase moisture. My learning experience during this was that a cake that size needs a piece of plywood under the cake board. I covered it with a pretty piece of fabric and it made the final product even prettier.
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I doubled the recipe to make a 12x17" sheet cake for my daughter's baby shower and it was...