Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel and chop the sweet potato, carrots, and parsnips into uniform 1-inch pieces to ensure even cooking.
In a large bowl, toss the root vegetables with half of the olive oil, half of the minced garlic, and a pinch of the sea salt and black pepper.
Spread the seasoned vegetables in a single layer on one side of the prepared sheet pan.
Pat the chicken breast dry with a paper towel and rub with the remaining olive oil, garlic, rosemary, thyme, salt, and pepper.
Place the chicken breast on the other side of the sheet pan, leaving space for air to circulate.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are golden and tender.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.