Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel and cut it into uniform 1-inch cubes.
Rinse and drain the chickpeas, then roll them between two clean kitchen towels to remove as much moisture as possible.
In a large mixing bowl, combine the cubed chicken, dried chickpeas, broccoli florets, and diced red bell pepper.
Drizzle the olive oil over the mixture and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything thoroughly until the spices are evenly distributed across the chicken and vegetables.
Spread the mixture in a single layer on the prepared baking sheet, ensuring enough space for air to circulate.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the chickpeas are golden and crisp.
Remove from the oven and immediately drizzle with fresh lemon juice to brighten the flavors before serving.