Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast, bell pepper, zucchini, and red onion into uniform, bite-sized pieces to ensure even cooking.
In a large mixing bowl, combine the chopped chicken, vegetables, and the drained and rinsed chickpeas.
Drizzle the olive oil over the mixture and sprinkle with dried oregano, garlic powder, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated with the oil and seasonings.
Spread the medley in a single layer on the prepared baking sheet, ensuring it is not overcrowded so the vegetables roast rather than steam.
Roast for 20-25 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven, drizzle with fresh lemon juice, and garnish with chopped fresh parsley before serving warm.