Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel the sweet potato and carrots, then dice them into uniform 1-inch cubes for even cooking.
Mince the garlic cloves finely.
In a large mixing bowl, combine the chicken breast, diced sweet potatoes, and carrots.
Drizzle with olive oil and add the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and spices.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring the chicken has space around it.
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 to keep it juicy.
Plate the sliced chicken alongside the roasted vegetables and enjoy immediately.