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, fresh lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken breast, broccoli florets, chopped red bell pepper, and sliced zucchini onto the prepared sheet pan.
Drizzle 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 pieces are not crowded so they roast rather than steam.
Slide the pan into the oven and bake for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with lightly charred edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.