Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper or lightly oil it.
Trim any excess fat from the chicken thighs and pat them dry with paper towels, which helps achieve crispy skin.
Place the chicken thighs on the prepared baking sheet, skin side up, and rub them gently with a little olive oil, salt, and pepper for flavor and crispiness.
Scatter the sweet potato chunks around the chicken, drizzle them with the remaining olive oil, and sprinkle with chopped rosemary, minced garlic, salt, and pepper.
Roast in the oven for about 45 minutes, or until the chicken skin is golden and crispy, and the sweet potatoes are caramelized and tender when pierced with a fork.
Once done, remove from the oven and let rest for 5 minutes—the aroma of garlic and rosemary will fill the kitchen.
Serve the crispy-skinned chicken thighs alongside the caramelized sweet potatoes, garnished with additional fresh rosemary if desired, and enjoy this hearty fall-inspired dish.