I heat up my corn tortillas one at a time on my cast iron griddle, and this covered warmer keeps the already cooked ones warm. The shallow design limits the air space, which is probably why this works better than a covered casserole dish. It does not keep them from getting a little soggy, though, because of the trapped steam. I solved this problem by placing the lid on very slightly askew so steam has an escape route and they don't get as flimsy by the end of the meal. My husband scoffed at this purchase, but he has come around.