1. In a small bowl, mix together chili powder, cumin, garlic powder, salt, and pepper.

2. Rub the spice mixture onto chicken breasts, ensuring they are evenly coated.

3. Heat olive oil in a pan over medium heat.

4. Add the seasoned chicken breasts to the pan and cook for 6-8 minutes on each side, or until cooked through.

5. Serve hot with your favorite Mexican sides like rice, beans, and salsa.