Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Pat the chicken breast dry and cut into 1-inch bite-sized pieces.
Rinse and drain the chickpeas, then pat them very dry with a kitchen towel to ensure they get crispy.
Place the chicken, chickpeas, broccoli florets, and sliced bell peppers on the baking sheet.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika, tossing well to coat.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden.
In a small bowl, whisk together the tahini and lemon juice with a splash of water to create a smooth drizzle.
Transfer the roasted mixture to a bowl and finish with the lemon-tahini dressing.