2. Add diced sweet potatoes and cook until tender, about 10 minutes.
3. Add black beans, cumin, chili powder, salt, and pepper. Cook for another 5 minutes.
4. Place a tortilla in a separate skillet over medium heat. Sprinkle with cheese, then add the sweet potato and black bean mixture. Top with another tortilla.
5. Cook until the bottom tortilla is golden brown, then flip and cook the other side until golden brown and the cheese is melted.