Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
In a small mixing bowl, whisk together the olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Peel and slice the carrots and parsnip into 1-inch thick rounds or sticks.
Place the chicken breast, carrots, and parsnips on the prepared baking sheet in a single layer.
Drizzle the herb oil mixture over the chicken and vegetables, tossing the vegetables and rubbing the chicken to ensure everything is evenly coated.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the root vegetables are tender and lightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing it against the grain.
Plate the sliced chicken alongside the roasted vegetables and serve immediately.