Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel and chop the carrots and parsnips into uniform 1-inch chunks to ensure even roasting.
In a large mixing bowl, toss the chopped root vegetables with 0.5 tablespoon of avocado oil, half the sea salt, and half the black pepper.
Pat the chicken thigh and drumstick dry with a paper towel to help the herbs adhere and create a better roast.
In a small ramekin, combine the remaining avocado oil, minced garlic, dried rosemary, and dried thyme.
Rub the garlic-herb mixture thoroughly over all sides of the chicken pieces, then season with the remaining salt and pepper.
Spread the seasoned vegetables across the baking sheet and nestle the chicken pieces among them so they are not overcrowded.
Roast in the center of the oven for 30 to 35 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before serving to allow the juices to redistribute.