The only bean burger recipe you'll ev... oh, heck, just try the recipe !
This bean burger recipe uses eggs, so it's not vegan.
http://www.cookingchanneltv.com/recipes/really-simple-bean-burgers.html
We tried this first with black-eyed peas, which made for really tasty burgers -- wouldn't put American/Cheddar cheeze on them, but Jack cheeze might work. I did have to add a little of the liquid to get the consistency right for patties. Black beans worked great. My mom just cooked the beans and mashed them up to the right consistency, none of this one-can-only business. She used a patty mold which *really* worked better than forming them by hand. Pinto beans made for less flavorful burgers, so it's worth looking at the flavor variations in the original if you want to use those. There's some kind of glitch in the text describing the amound of olive oil used -- we just use a "squirt", which is probably less than the original called for, but works fine.
Next up for us - red beans, maybe Cajun flavored ?