I don't know what your definition of GOOD is; all the veggie burgers all over property are the same. They're Gardenburger Malibu burgers (similar to what's sold to the public as the Gardenburger California burger) and personally, I really like them. They're the style that has big chunks of veggie, not the style that resembles meat.
Cosmic Ray's, Pecos Bills, Liberty Inn, and Restaurantosaurus all have toppings bars for them. Almost anywhere that sells a regular burger will sell a veggie burger--that goes for QS and some TS like Beaches n Cream and Sci-Fi.