I can't stand those shrink-wrapped ones that get all pasty and gluey, or the rubbery ones you find in most health food stores.
As for the standard café l-f muffins, they're usually huuuge and not really healthy.
Any tasty, healthy muffins in Manhattan? Ideally on the UWS, but I'm willing to travel to satisfy this craving...
Fat-free works too, as long as the taste criterium is met.