Steps
1. In a small bowl, mix together the mustard, honey, olive oil, salt, and pepper.
2. Rub the mixture all over the chicken thigh, ensuring it's well-coated.
3. If using, place the rosemary on top of the chicken for added flavor.
4. Preheat a skillet over medium heat and add a little olive oil.
5. Place the marinated chicken thigh in the skillet and cook for about 6-7 minutes on each side, or until the internal temperature reaches 165°F (75°C).
6. Remove from the heat and let it rest for a couple of minutes before serving.