Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Prepare the vegetables by dicing the sweet potato and carrots into 1-inch cubes and halving the Brussels sprouts.
Mince the garlic clove finely.
In a large mixing bowl, combine the chicken breast, sweet potatoes, carrots, and Brussels sprouts.
Drizzle the olive oil over the mixture and sprinkle with sea salt, black pepper, rosemary, thyme, and minced garlic.
Toss everything thoroughly until the chicken and vegetables are evenly coated in oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, ensuring 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 lightly browned.
Let the chicken rest for 3 minutes before serving to ensure it remains juicy.