Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Drain and rinse the chickpeas, then pat them very dry with a clean kitchen towel to ensure maximum crispiness.
Cut the chicken breast into bite-sized pieces and slice the red bell pepper into thin strips.
Place the chickpeas, chicken, broccoli florets, and bell pepper on the prepared baking sheet.
Drizzle with olive oil and season evenly with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything thoroughly with your hands or tongs to coat, then spread into a single, even layer.
Roast for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden and crunchy.
Remove from the oven and immediately drizzle with fresh lemon juice before transferring to a bowl.