Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and dice the carrots, parsnips, and sweet potato into uniform 1-inch cubes to ensure even cooking.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, toss the diced root vegetables with 0.5 tbsp of olive oil, half of the minced garlic, half of the fresh herbs, sea salt, and black pepper.
Rub the chicken breast with the remaining 0.5 tbsp of olive oil, the rest of the garlic, and the remaining herbs.
Spread the seasoned vegetables in a single layer on the prepared baking sheet, leaving space in the center for the chicken.
Place the chicken breast in the center of the sheet and roast for 25-30 minutes, or 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 and serving alongside the roasted root vegetables.