Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and chop the carrots and sweet potato into uniform 1-inch cubes to ensure even cooking.
Mince the garlic cloves finely.
In a large mixing bowl, combine the chicken breast, chopped root vegetables, and minced garlic.
Drizzle the olive oil over the mixture and sprinkle with dried rosemary, dried thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and herbs.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast in the center of the oven for 25 to 30 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.