Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper to create the marinade.
Place the chicken breast, rinsed chickpeas, broccoli florets, chopped red bell pepper, and sliced red onion onto the prepared baking sheet.
Pour the lemon-herb marinade over the chicken and vegetables, using your hands or tongs to toss everything until thoroughly and evenly coated.
Spread the ingredients into a single layer, ensuring the chicken has enough space to roast properly without steaming.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender with slightly browned edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into strips.
Serve the sliced chicken alongside the roasted vegetable and chickpea mixture, drizzling any remaining juices from the pan over the top for extra flavor.