Preheat Oven: Preheat your oven to 425°F (220°C).
Prepare Chicken: Pat chicken thighs dry with paper towels (this helps crisp up the skin). Season generously with salt, pepper, lemon zest, paprika, and half of the garlic-herb mixture.
Season Potatoes: In a large bowl, toss halved potatoes with olive oil, remaining garlic, thyme, rosemary, salt, and pepper.
Arrange on Baking Sheet: Place chicken thighs skin-side up on a large baking sheet or roasting pan. Scatter potatoes around the chicken. Add lemon slices in between for extra flavor.
Roast: Roast for 40–45 minutes, or until chicken reaches 165°F (74°C) internal temperature and potatoes are golden and crispy. Halfway through, toss potatoes gently for even crisping.
Finish with Lemon: Squeeze fresh lemon juice over the roasted chicken and potatoes just before serving.
Serve: Transfer to a platter, garnish with parsley, and serve hot.