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 into 1/2-inch cubes, halving the Brussels sprouts, and slicing the carrots into rounds.
Mince the garlic cloves and place them in a large mixing bowl along with the chicken breast and prepared vegetables.
Drizzle the olive oil over the mixture and sprinkle with dried rosemary, dried thyme, sea salt, and black pepper.
Toss everything thoroughly with your hands or tongs to ensure the chicken and vegetables are evenly coated in oil and herbs.
Spread the ingredients in a single layer on the baking sheet, ensuring the chicken has enough space to roast evenly.
Bake for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and golden-brown.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into strips to serve alongside the roasted vegetables.