Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the carrot and sweet potato, then dice them into uniform 1-inch cubes to ensure even cooking.
Mince the garlic cloves finely.
Place the chicken breast and diced vegetables in a large mixing bowl.
Drizzle with olive oil and sprinkle with the garlic, rosemary, thyme, sea salt, and black pepper.
Toss the mixture thoroughly until every piece is evenly coated in oil and seasonings.
Spread the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they are not crowded.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender and lightly browned.
Allow the chicken to rest for 5 minutes before slicing and serving alongside the roasted vegetables.