Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Rinse and drain the chickpeas, then pat them very dry with a clean kitchen towel to ensure they get crispy.
Cut the chicken breast into 1-inch cubes and thinly slice the red bell pepper.
In a large mixing bowl, combine the chicken, chickpeas, broccoli, and peppers.
Drizzle with olive oil and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper, tossing until everything is evenly coated.
Spread the mixture in a single layer on the baking sheet, ensuring the chicken pieces are not touching for even browning.
Roast for 20 to 25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the chickpeas are golden.
Remove from the oven and drizzle fresh lemon juice over the bowl before serving warm.