1. Heat olive oil in a skillet over medium heat.
2. Add diced sweet potatoes, cumin, chili powder, salt, and pepper. Cook until tender, about 10 minutes.
3. Add black beans to the skillet and cook for another 5 minutes.
4. Remove from heat and set aside.
5. Heat another skillet over medium heat. Place one tortilla in the skillet.
6. Sprinkle cheese over the tortilla, then add a portion of the sweet potato and black bean mixture.
7. Top with another tortilla and cook until the bottom tortilla is golden brown, about 2-3 minutes.
8. Flip the quesadilla and cook the other side until golden brown and the cheese is melted.
9. Repeat with remaining tortillas and filling.
10. Cut into wedges and serve warm.