Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Prepare the vegetables by halving the Brussels sprouts, slicing the carrots into rounds, and dicing the zucchini into thick half-moons.
In a small bowl, whisk together the olive oil, lemon juice, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken breast and the prepared vegetables on the sheet pan, ensuring they are in a single layer for even cooking.
Drizzle the herb and lemon oil mixture over the chicken and vegetables, tossing well to ensure every piece is thoroughly coated.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and lightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy.
Serve the sliced chicken alongside the roasted vegetables, drizzling any remaining pan juices over the top for extra flavor.