Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces and dice the bell pepper, zucchini, and red onion into similar sizes.
In a large mixing bowl, combine the chicken, chickpeas, and chopped vegetables.
Drizzle the olive oil over the mixture and sprinkle with garlic powder, dried oregano, sea salt, and black pepper.
Toss everything together until the chicken and vegetables are evenly coated with the oil and spices.
Spread the mixture in a single, even layer on the prepared baking sheet to ensure even roasting.
Roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
Remove from the oven and immediately drizzle with fresh lemon juice before serving warm.