Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato and carrots into half-inch cubes, and cut the red onion into small wedges.
Finely mince the garlic cloves and roughly chop the fresh rosemary and thyme leaves.
In a large mixing bowl, toss the prepared vegetables with half of the olive oil, half of the minced garlic, half of the herbs, and a pinch of salt and pepper.
Pat the chicken breast dry with a paper towel and rub it thoroughly with the remaining olive oil, garlic, herbs, salt, and pepper.
Spread the seasoned vegetables in a single layer on the baking sheet, leaving space in the center for the chicken.
Place the chicken breast in the center and roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are golden and tender.
Remove from the oven and allow the chicken to rest for 5 minutes before slicing to ensure it stays juicy and flavorful.