Preheat oven to 400°F (200°C). Toss potatoes and carrots with 1 tbsp oil, salt, and pepper; spread in a large roasting pan.
Pat chicken dry, rub with remaining oil, salt, pepper, and thyme; nestle thighs skin-side up among vegetables.
Whisk honey, soy sauce, garlic, and Dijon; brush half over chicken and veggies.
Roast 35–40 minutes until chicken reaches 165°F and vegetables are tender, basting with remaining sauce halfway through.
Broil 2–3 minutes if you want extra-crispy skin; let rest 5 minutes before serving.