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 rounds or chunks to ensure even cooking.
In a small bowl, mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
Place the chopped root vegetables on one side of the baking sheet, drizzle with 1 teaspoon of olive oil, and sprinkle with half of the salt and pepper.
Rub the chicken breast with the remaining teaspoon of olive oil, the minced garlic, the fresh herbs, and the remaining salt and pepper.
Place the seasoned chicken breast on the other side of the baking sheet.
Roast in the center of the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.