Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Peel the carrots and parsnips, then chop them into uniform 1-inch pieces to ensure even cooking.
In a medium bowl, toss the chopped root vegetables with 0.5 tablespoons of olive oil and half of the salt and pepper.
Spread the vegetables in a single layer on the prepared baking sheet, leaving space in the center for the chicken.
Mince the garlic and finely chop the fresh rosemary and thyme.
Rub the chicken breast with the remaining 0.5 tablespoons of olive oil, minced garlic, fresh herbs, and the remaining salt and pepper.
Place the seasoned chicken breast in the center of the baking sheet nestled among the vegetables.
Roast for 22 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it remains juicy.