Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Pat the chicken breast dry with paper towels and cut into 1-inch bite-sized pieces.
Rinse and drain the chickpeas, then roll them between two clean kitchen towels to remove as much moisture as possible for maximum crunch.
Chop the broccoli into small florets and dice the red bell pepper into 1-inch squares.
Place the chicken, chickpeas, broccoli, and peppers onto the prepared baking sheet.
Drizzle with olive oil and sprinkle evenly with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything thoroughly with your hands or tongs to ensure an even coating of oil and spices, then spread into a single layer.
Roast in the oven for 20-25 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the chickpeas are golden.
While the bowl base roasts, whisk together the tahini, lemon juice, and water in a small ramekin until the dressing is smooth and creamy.
Transfer the roasted chicken and veggie mixture to a serving bowl and finish by drizzling the tahini sauce over the top.