Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel the carrots and parsnips, then chop them into uniform 1-inch pieces to ensure even cooking.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, chopped root vegetables, olive oil, minced garlic, herbs, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated in the herb oil.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the chicken pieces are not crowded by the vegetables.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are golden brown and tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the meat juicy and flavorful.