Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Drain and rinse the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure maximum crispiness.
Dice the chicken breast into bite-sized pieces and chop the red bell pepper into similar sizes.
Place the chicken, chickpeas, broccoli florets, and bell peppers onto the prepared sheet pan.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika.
Toss the ingredients directly on the pan until everything is evenly coated, then spread them out into a single layer.
Roast in the oven for 20 to 25 minutes, giving the pan a good shake halfway through, until the chicken is cooked and the chickpeas are golden.
While roasting, whisk together the lemon juice and tahini in a small bowl, adding a teaspoon of warm water if needed to reach a drizzling consistency.
Transfer the roasted mixture to a bowl and finish by drizzling the zesty tahini dressing over the top.