I just used the giant cupcake pan for the first time..and it was a disaster! The outside looked normal, the middle was rock hard and the top was under-done. What am I doing wrong??

What temp did you bake at? Might be better baking at a lower temp for longer time

This might help you out too!

http://www.wilton.com/cupcakes/making-cupcakes/batter-amounts.cfm