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 shapes.
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 pieces, broccoli florets, sliced bell peppers, and zucchini onto the prepared sheet pan.
Drizzle the lemon-herb dressing over the chicken and vegetables, tossing thoroughly to ensure everything is evenly coated.
Spread the mixture into a single layer, ensuring the pieces are not overcrowded to allow for even roasting.
Roast in the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly browned edges.