Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Dice the chicken breast into 1-inch cubes and place them on the prepared baking sheet.
Add the rinsed and dried chickpeas, broccoli florets, and sliced red bell pepper to the sheet with the chicken.
Drizzle the olive oil over the mixture and sprinkle evenly with garlic powder, smoked paprika, sea salt, and black pepper.
Toss all ingredients together with your hands or tongs until everything is well-coated in oil and spices.
Spread the mixture into a single layer, ensuring the chicken and vegetables aren't overcrowded.
Roast for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are slightly charred.
Remove from the oven, drizzle with fresh lemon juice, and toss once more before serving in a bowl.