Preheat your oven to 400°F and line a large sheet pan with parchment paper.
Pat the chicken breast dry with paper towels to ensure a golden sear.
In a large bowl, toss the chopped carrots, parsnips, and red onion with half of the olive oil, sea salt, and black pepper.
Place the vegetables on the prepared sheet pan, spreading them out into a single layer.
Rub the chicken breast with the remaining olive oil, minced garlic, rosemary, and thyme.
Nestle the chicken breast in the center of the vegetables on the sheet pan.
Roast for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and browned.
Let the chicken rest for 5 minutes before slicing to keep it juicy.