Definitely the best food option in terminal 1, C gates. FYI it's inside security, near gate C22.
Regular jersey mikes fare, though only one size sandwich available (regular 7") and possibly missing some options. Also I think more expensive than normal.
In case you're not familiar with this suburban chain, it's a decent quality deli sandwich; order of magnitude better than subway. They also have a decent hot cheesesteak (beef or chicken).
My go to order is a #7 on wheat, mikes way plus spicy mustard. Mikes way definitely makes their sandwiches good, make sure to get it.