Preheat your oven to 425°F (220°C). This hot start helps the chicken skin crisp and the potatoes brown nicely.
Pat the chicken thighs dry with paper towels. Dry skin = crispier skin. Season the thighs on both sides with half a teaspoon of salt and a pinch of pepper.
In a large bowl, toss the sweet potato cubes with 1 tablespoon of olive oil, a pinch of salt, and a little pepper. If you’re using carrots or other vegetables, add them now and toss to coat.
Spread the seasoned sweet potatoes (and any other vegetables) in a single layer on a baking sheet or roasting pan. Place the seasoned chicken thighs on top, skin side up. This arrangement helps the chicken baste in its own juices as it roasts.
In a small bowl, mix the remaining olive oil, minced garlic, thyme, rosemary, paprika, and lemon juice (if using). Brush this herb oil all over the chicken thighs and potatoes, turning slightly to coat evenly.
Roast in the oven for about 25-30 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the potatoes are tender and golden. If you want extra crispiness, you can switch to broil for the last 2-3 minutes—watch closely to avoid burning.
Remove from the oven and rest for 5 minutes. Garnish with chopped parsley if you like, then serve warm.