Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Peel and dice the sweet potato and carrots into uniform 1-inch cubes to ensure they cook at the same rate.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves, discarding the woody stems.
In a large mixing bowl, toss the diced root vegetables with half of the olive oil, salt, pepper, and half of the chopped herbs.
Pat the chicken breast dry with a paper towel, then rub with the remaining olive oil, minced garlic, and the rest of the herbs.
Spread the seasoned vegetables in a single layer on the prepared baking sheet, leaving space in the center for the chicken.
Place the chicken breast in the center of the pan and roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the meat stays juicy and flavorful.