Chef Jim Gray says:

I like my chili spicy and this recipe calls for hot Mexican-style chili powder, which also contains cumin and other dried herbs. But because I like flavorful heat, sometimes I’ll even add up to four whole chipotle peppers, lending their smoky taste to my chili (I remove the chipotles before finishing the dish).

Please note, too, that as a devotee of Texas-style chili, I do not use beans. However, since this is truly a vegetarian dish and, shudder, a vegan one, too, you could add any style beans you wanted.