1. Preheat the oven to 400 degrees. In a medium bowl, toss the sweet potatoes in the olive oil and scatter on the bottom of a roasting pan. Roast for 15 minutes.Rub
2. In a small bowl, mix together the chiles, garlic, honey, vinegar, salt, cumin and cinnamon to make a paste. Rub the paste evenly over each breast.
3. Place the chicken breasts on top of the sweet potatoes and roast until the chicken is just cooked through, about 25 to 30 minutes. Serve garnished with cilantro if desired.