Preheat your oven to 400°F (200°C).
In a small bowl, mix the maple syrup, Dijon mustard, salt, and pepper.
Place the chicken in a baking dish and pour the maple mixture over it.
In a separate bowl, toss the sweet potatoes with olive oil, cinnamon, salt, and pepper until evenly coated.
Arrange the sweet potatoes around the chicken in the baking dish.
Bake in the preheated oven for 25-30 minutes, or until the chicken is cooked through.
Remove the dish from the oven and let it rest for 5 minutes before serving.
Garnish with fresh parsley before serving.