Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and chop the carrots, parsnips, and red potato into uniform 1-inch cubes to ensure even cooking.
In a large mixing bowl, toss the chopped vegetables with half of the olive oil, half of the sea salt, and half of the black pepper.
Spread the seasoned vegetables in a single layer on the prepared baking sheet.
Mince the garlic cloves and combine them in a small bowl with the remaining olive oil, rosemary, thyme, salt, and pepper.
Rub the garlic-herb mixture evenly over all sides of the chicken breast.
Nestle the chicken breast in the center of the baking sheet, pushing the vegetables to the sides.
Roast in the oven for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are golden and tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.