Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and carrots, then dice them into uniform 1-inch cubes to ensure they roast evenly.
Mince the garlic cloves and finely chop the fresh parsley for the garnish.
In a large mixing bowl, whisk together the extra virgin olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Add the chicken breast and the diced root vegetables to the bowl, tossing thoroughly until every piece is well-coated in the herb oil.
Spread the mixture onto the prepared baking sheet in a single layer, making sure the pieces are not overcrowded so they can crisp up.
Roast for 25 to 30 minutes, or until the chicken is cooked through and the vegetables are tender and lightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into strips.
Garnish the chicken and vegetables with fresh parsley and serve immediately while hot.