Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Cut the chicken breast into bite-sized cubes and slice the bell pepper and red onion into thin strips.
In a large mixing bowl, combine the chicken, chickpeas, broccoli, bell pepper, and onion.
Drizzle with olive oil and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper.
Toss everything together until the ingredients are evenly coated with oil and spices.
Spread the mixture in a single layer on the prepared sheet pan, ensuring nothing is overcrowded.
Roast for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly charred.
Remove from the oven and immediately drizzle with fresh lemon juice before serving in a bowl.