Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and chop the carrots and sweet potatoes into uniform 1-inch cubes to ensure even roasting.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a large mixing bowl, combine the chicken breast, chopped carrots, and sweet potatoes.
Drizzle with olive oil and sprinkle with the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss the mixture thoroughly until the chicken and vegetables are evenly coated in the oil and aromatics.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the root vegetables are tender and golden brown.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving.