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 chop the bell pepper and zucchini into similar sized chunks.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken, broccoli florets, bell peppers, and zucchini onto the prepared sheet pan.
Drizzle the lemon-herb dressing 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, ensuring the pieces aren't too crowded so they roast rather than steam.
Bake 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, optionally garnishing with fresh parsley or an extra squeeze of lemon.