Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces and chop the bell pepper and zucchini into similar-sized chunks.
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 pieces, broccoli florets, bell pepper, and zucchini on the prepared baking sheet.
Drizzle the lemon-herb marinade over the chicken and vegetables, then toss thoroughly with your hands or tongs to ensure everything is evenly coated.
Spread the mixture out into a single layer to ensure even roasting and prevent steaming.
Roast in the center of the oven for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly browned at the edges.
Remove from the oven and serve immediately while hot and fragrant.