Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and chop the carrots, parsnips, and red potato into uniform 1-inch pieces to ensure even cooking.
In a large mixing bowl, toss the chopped root vegetables with 0.5 tablespoons of olive oil, half of the minced garlic, and half of the rosemary and thyme.
Pat the chicken breast dry with a paper towel and rub with the remaining 0.25 tablespoons of olive oil, garlic, rosemary, thyme, sea salt, and black pepper.
Spread the seasoned vegetables in a single layer on the prepared baking sheet and roast for 15 minutes.
Remove the sheet from the oven, toss the vegetables to ensure even browning, and place the chicken breast in the center of the pan.
Return the pan to the oven and roast for an additional 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F.
Allow the chicken to rest for 5 minutes before slicing to keep it juicy, then serve alongside the tender roasted vegetables.