Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the sweet potato and carrots, then dice them into uniform 1/2-inch cubes to ensure they roast evenly.
In a small mixing bowl, whisk together the olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken breast and the prepared root vegetables onto the baking sheet.
Drizzle the herb-infused oil over the chicken and vegetables, using your hands or a spatula to toss everything until thoroughly coated.
Arrange the ingredients in a single layer, placing the chicken in the center with the vegetables spread out around it.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and lightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it remains juicy and flavorful.