Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Prepare the vegetables by slicing the carrots into thin rounds and the zucchini into half-moons.
Place the chicken breast on one side of the baking sheet and arrange the broccoli, carrots, and zucchini on the other side.
Drizzle the olive oil evenly over the chicken and the vegetable medley.
In a small bowl, combine the dried rosemary, dried thyme, sea salt, black pepper, and garlic powder.
Sprinkle the herb seasoning mixture over both the chicken and the vegetables, tossing the vegetables slightly to ensure an even coating.
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.
Remove from the oven and allow the chicken to rest for 5 minutes before slicing it into strips.
Plate the sliced chicken alongside the roasted vegetables and serve immediately.