Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Prepare the vegetables by slicing the carrot into thin rounds and chopping the zucchini into half-moons.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, dried oregano, sea salt, and black pepper until emulsified.
Place the chicken breast, broccoli florets, sliced carrots, and zucchini on the prepared baking sheet in a single layer.
Drizzle the lemon-herb marinade over the chicken and vegetables, using your hands or tongs to toss everything until thoroughly and evenly 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 with slightly caramelized edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing; garnish the entire dish with fresh chopped parsley.