Preheat your oven to 400°F (200°C) 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 they achieve a crispy texture.
Cut the chicken breast into bite-sized 1-inch cubes and slice the red bell pepper into thin strips.
In a large mixing bowl, combine the chicken, chickpeas, broccoli florets, and bell peppers.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika, tossing well to coat every piece evenly.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the ingredients are not overcrowded.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden and crisp.
Remove from the oven and finish with a bright squeeze of fresh lemon juice before serving.