Preheat your oven to 400°F (200°C) and line a large 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 uniform strips.
Place the chicken pieces, broccoli florets, sliced bell peppers, and zucchini onto the prepared sheet pan.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Drizzle the lemon-herb dressing over the chicken and vegetables, tossing thoroughly to ensure every piece is well coated.
Spread the ingredients out into a single layer, ensuring they are not overcrowded so they roast rather than steam.
Bake for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly caramelized edges.
Remove from the oven and serve immediately, perhaps with an extra squeeze of fresh lemon for a bright finish.