Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the carrots and parsnips, then slice them into 1-inch thick rounds or chunks to ensure even cooking.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken breast and the chopped root vegetables in a large mixing bowl and pour the herb oil mixture over them.
Toss thoroughly until the chicken and vegetables are completely and evenly coated in the aromatics.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring the chicken is not covered by the vegetables.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender and caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing.
Garnish with freshly chopped parsley and serve warm.