For those who think that One World has limited vegan options, note that the following are also easily made vegan (with casein-free soy cheese and soy mayo):
-Philly Cheese "Steak-less"
These are, hands down, my two favorite menu items. I don't know why they don't have the "V" sign next to them (signifying that they can be made vegan upon request) but I've had numerous vegan friends who work at One World assure me that there's nothing besides the cheese that makes them non-vegan. The Philly Cheese Steak-less is the best vegan Philly cheese steak I have ever eaten (and I've had quite a few).
Sadly, the person who posted below is right about the desserts. I used to go to One World and find AMAZING vegan desserts every time I went. These days, it has been pretty disappointing. I haven't seen vegan cakes the last couple of times I have gone (which were always my favorite dessert at One World). There have been vegan brownies and cookies, but they tend to be dry and bland (maybe they're just sitting on the counter for a long time between deliveries).