In a medium bowl, whisk together the maple syrup, minced garlic, soy sauce, olive oil, salt, and black pepper to prepare the marinade.
Pat the chicken thighs dry with paper towels. Place them in the bowl with the marinade and toss gently to coat all sides. Let marinate for at least 15 minutes or up to an hour.
In a separate bowl, toss the diced sweet potatoes with paprika, dried thyme, a pinch of salt, and a drizzle of olive oil.
Preheat the oven to 425°F (220°C). Arrange the marinated chicken thighs skin-side up on one half of a baking sheet. Spread the seasoned sweet potatoes evenly on the other half, avoiding overcrowding.
Bake for 35-40 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the skin is crisp and caramelized. Sweet potatoes should be tender and browned on the edges.
Sprinkle freshly chopped parsley over the chicken and sweet potatoes. Serve immediately and enjoy.