Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel the carrots and parsnips, then slice them into uniform one-inch chunks to ensure even cooking.
Place the chicken breast on one side of the prepared baking sheet and arrange the vegetable chunks on the other side.
Drizzle the olive oil over both the chicken and the vegetables, then sprinkle evenly with sea salt, black pepper, rosemary, thyme, and garlic powder.
Toss the vegetables to coat them thoroughly and rub the seasoning into both sides of the chicken breast.
Roast in the center of the oven for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
Remove from the oven and let the chicken rest for five minutes before slicing it into strips and serving alongside the roasted roots.