Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Pat the chicken legs dry with a paper towel to ensure the skin gets extra crispy during roasting.
In a small bowl, whisk together the olive oil, rosemary, thyme, garlic powder, sea salt, and black pepper.
Place the chicken legs, halved Brussels sprouts, and sliced carrots on the prepared baking sheet.
Drizzle the herb oil mixture over the chicken and vegetables, tossing well to ensure everything is evenly coated.
Arrange the chicken skin-side up and spread the vegetables in a single layer around the meat.
Roast for 35 to 40 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Let the chicken rest for 5 minutes before serving to allow the juices to redistribute.