Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and slice the bell pepper and zucchini into similar sized chunks.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken, broccoli, bell pepper, and zucchini on the prepared sheet pan.
Drizzle the oil and herb mixture over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure every piece is well-coated.
Spread the ingredients into a single layer, ensuring they aren't overcrowded so they roast rather than steam.
Bake for 18-22 minutes, or until the chicken is cooked through to an internal temperature of 165°F and the vegetables are tender and slightly charred.
Remove from the oven and immediately drizzle with the fresh lemon juice before serving.