Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and chop the carrots and parsnips into 1-inch rounds, and cut the red potato into 1-inch cubes.
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 vegetables in a single layer on the prepared baking sheet, leaving space in the center for the chicken.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
Pat the chicken breast dry with a paper towel, then rub it thoroughly with the remaining olive oil, minced garlic, rosemary, thyme, salt, and pepper.
Place the seasoned chicken breast in the center of the baking sheet surrounded by the vegetables.
Roast in the oven for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and golden brown.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the juices redistribute.
Serve the sliced chicken alongside the roasted root vegetables.