Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, dried oregano, sea salt, and black pepper until well combined.
Place the chicken breast, broccoli florets, sliced carrots, and sliced zucchini onto the prepared sheet pan.
Pour the lemon-herb marinade over the chicken and vegetables, using your hands or tongs to toss everything until thoroughly and evenly coated.
Spread the ingredients out into a single layer, ensuring the chicken is in the center and the vegetables have enough space to roast rather than steam.
Roast in the oven for 20 to 25 minutes, or until the chicken is cooked through to 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 to ensure the juices stay locked in.