Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel the sweet potato and carrots, then chop them into uniform 1-inch cubes to ensure even cooking.
Mince the garlic clove finely.
In a large mixing bowl, combine the chicken breast, chopped sweet potatoes, and carrots.
Drizzle the olive oil over the mixture and add the rosemary, thyme, sea salt, black pepper, and minced garlic.
Toss everything thoroughly until the chicken and vegetables are well-coated in the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces aren't overcrowded.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender and slightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.