Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel and chop the carrots, parsnips, and sweet potato into uniform 1-inch cubes to ensure even cooking.
In a large mixing bowl, toss the chopped root vegetables with 0.5 tablespoons of olive oil and half of the rosemary, thyme, salt, and pepper.
Spread the seasoned vegetables in a single layer across the prepared baking sheet.
Rub the chicken breast with the remaining 0.5 tablespoons of olive oil, minced garlic, and the rest of the herbs, salt, and pepper.
Nestle the chicken breast into the center of the vegetables on the baking sheet.
Roast for 25 to 30 minutes until the chicken reaches an internal temperature of 165°F and the vegetables are tender with caramelized edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it succulent and juicy.