Optional: avocado, pitted and cubed; cilantro, chopped; lime
Coat tofu in taco seasoning. Add oil to a pan set to medium-high heat. Add tofu and cook until browned; set aside (if crumbling tofu, add to pan and sprinkle with taco seasoning).
Add black beans and corn to two separate pots set to medium heat. Heat until cooked through. Warm tortillas in a separate pan.
To assemble, add tofu, black beans, corn, and lettuce. Top with avocado, cilantro, and lime juice if desired.