Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes, slice the carrot into rounds, and chop the zucchini into half-moons.
Mince the garlic cloves finely.
Place the chicken breast in the center of the baking sheet and arrange the sweet potato, broccoli, carrot, and zucchini around it in a single layer.
Drizzle the olive oil over the chicken and vegetables, then sprinkle evenly with sea salt, black pepper, rosemary, thyme, and minced garlic.
Toss the vegetables with your hands or tongs to ensure they are well-coated, and rub the seasoning into both sides of the chicken.
Roast for 20 to 25 minutes, or until the chicken is cooked through to an internal temperature of 165°F and the vegetables are tender and golden.
Remove from the oven and let the chicken rest for 5 minutes before slicing it against the grain to serve.