Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Drain and rinse the chickpeas, then pat them thoroughly dry with a paper towel to ensure maximum crispiness.
Cut the chicken breast into 1-inch bite-sized cubes and chop the broccoli and red bell pepper into similar sized pieces.
Place the chicken, chickpeas, broccoli, and bell peppers onto the prepared baking sheet.
Drizzle the olive oil over the ingredients and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper.
Toss everything together directly on the pan until evenly coated, then spread into a single layer.
Roast for 20 to 25 minutes, tossing the mixture halfway through, until the chicken is cooked through and the chickpeas are golden.
Remove from the oven and immediately drizzle with fresh lemon juice before transferring to a bowl to serve.