Hi,
Can you double check you pan size? Is it 10x15x2 or 11x15x2?
If its an 11x15 sheet pan, then it will take 11 cups of batter for a 2" pan.
If its a 10x15 sheet pan, i would do 10 cups (1 less than 11x15) for a 2"pan
HTH
Rather than measure batter by the cupful fill it 2/3rds to 3/4s full.
That is an unusual size so I'm not sure exactly how much batter; I suggest you start w/the batter of 2 cake mixes. probably need 3 mixes or close to that. You could make up that much and make cupcakes w/any extra batter.
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