No idea what you're really looking for in terms of food, breakfast in an airport is fairly generic IMO ... There is a sit down something in D before you get to the people mover next to Subway; in C, there is a california tortilla place or a sit down next to Burger King. There is also a potbelly (toasted sandwiches) down by c2 or so.
If you go to A, there is a 5 guys, a pizza place and another one that I've bought soup at but don't know the name.
If you really have time, go into B and visit Dunkin Donuts, and they have a few restaurants over that way as well (the sit down is a longer walk). B is connected to A