Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Rinse the chickpeas and pat them thoroughly dry with a clean kitchen towel; removing any loose skins will help them get extra crispy.
Cut the chicken breast into bite-sized 1-inch cubes.
In a large mixing bowl, combine the chicken cubes, dried chickpeas, olive oil, sea salt, black pepper, garlic powder, and smoked paprika, tossing until every piece is well-coated.
Spread the chicken and chickpea mixture in a single layer on the prepared baking sheet, ensuring they aren't overcrowded.
Roast for 15 minutes, then remove the pan and add the broccoli florets, tossing them with the rendered juices on the pan.
Return to the oven and roast for an additional 10 to 12 minutes until the chicken is cooked through and the chickpeas are golden and crisp.
Remove from the oven, drizzle with fresh lemon juice, and serve immediately.