Preheat oven to 400 °F and line a large baking sheet with parchment paper.
Peel and chop the carrots, parsnips, and sweet potato into uniform 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.
Pat the chicken breast dry and rub with the remaining olive oil, minced garlic, dried rosemary, dried thyme, and the remaining salt and pepper.
Arrange the vegetables in a single layer on the baking sheet, leaving space for the chicken breast in the center.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it remains juicy.