Preheat the oven to 400°F (200°C).

Prepare the maple glaze by whisking together the maple syrup, Dijon mustard, garlic powder, salt, and black pepper in a bowl.

Place the chicken breasts in a baking dish and pour half of the maple glaze over them, ensuring they are coated well.

Peel and chop the sweet potatoes into 1-inch cubes, then toss them with olive oil, cinnamon, salt, and pepper.

Arrange the sweet potatoes around the chicken in the baking dish.

Drizzle the remaining maple glaze over the sweet potatoes.

Bake in the preheated oven for 25-30 minutes or until the chicken is cooked through and potatoes are tender.

Let the dish rest for 5 minutes before serving.