Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and slice the carrots and parsnips into 1/2-inch thick rounds.
In a mixing bowl, toss the sliced root vegetables with 0.5 tablespoon of olive oil, half of the sea salt, and half of the black pepper.
Spread the vegetables in a single layer on one side of the prepared baking sheet.
Mince the garlic and finely chop the fresh rosemary and thyme.
Pat the chicken breast dry with a paper towel, then rub it with the remaining 0.5 tablespoon of olive oil, minced garlic, chopped herbs, and the rest of the salt and pepper.
Place the chicken breast on the other side of the baking sheet.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender and lightly browned.
Remove from the oven and let the chicken rest for 5 minutes to lock in the juices before slicing.
Plate the sliced chicken alongside the roasted vegetables and serve immediately.