Rub the chicken with 1 tablespoon of the olive oil. Season the chicken inside and outside with 3 teaspoons of salt and 1 teaspoon of black pepper. Stuff the chicken with 2 onion wedges, the halved garlic head, and thyme sprigs. Rub the outside of the chicken with the dry thyme, paprika and onion powder. Set the chicken aside.
Preheat your oven to 425°F.
In a large bowl, toss the potatoes, carrots, and remaining onion wedges with the remaining olive oil. Season with salt and pepper.
Place the tossed vegetables in the bottom of a large Dutch oven. Pour the chicken broth over the vegetables.
Place the chicken on top of the vegetables in the Dutch oven.
Cover the Dutch oven with the lid and roast for 40 minutes.
After 40 minutes, remove the lid and continue roasting for another 25–30 minutes, or until the chicken reaches an internal temperature of 165°F and the skin is golden and crispy. Occasionally spoon some of the pan juices over the chicken for added moisture and flavor.
Let the chicken rest for about 10 minutes before carving. Serve with the roasted vegetables and a ladle of the pan juices over the top.