Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and carrots, then dice them into uniform 1-inch cubes to ensure even roasting.
Finely mince the garlic clove.
In a mixing bowl, toss the diced sweet potato and carrots with 0.5 tablespoons of olive oil and half of the sea salt and black pepper.
Spread the vegetables in a single layer on one half of the prepared baking sheet.
Rub the chicken breast evenly with the remaining 0.5 tablespoons of olive oil, minced garlic, dried rosemary, dried thyme, and the remaining salt and pepper.
Place the seasoned chicken breast on the other half of the baking sheet next to the vegetables.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy and tender.