Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized cubes and drain and rinse the chickpeas, patting them dry with a towel.
Slice the zucchini into half-moons and chop the red bell pepper into one-inch pieces.
In a large mixing bowl, combine the chicken, chickpeas, zucchini, and bell peppers.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika, tossing well to coat evenly.
Spread the mixture in a single layer on the prepared baking sheet.
Roast for 18-20 minutes, or until the chicken is cooked through and the chickpeas are slightly golden and crisp.
While the bowl base roasts, whisk together the tahini and lemon juice in a small ramekin, adding a teaspoon of warm water if needed to reach a drizzling consistency.
Transfer the roasted chicken and vegetables to a serving bowl and finish with the lemon-tahini drizzle.