Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into 1-inch cubes and slice the carrots into 1/2-inch thick rounds to ensure they cook at the same rate.
In a large mixing bowl, combine the chicken breast, sweet potato, and carrots.
Drizzle the olive oil over the chicken and vegetables, then add the minced garlic, chopped rosemary, thyme, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, making sure the chicken pieces are not crowded.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy and flavorful.