Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Rinse the chickpeas and pat them very dry with a paper towel to ensure they get crispy in the oven.
Cut the chicken breast into 1-inch cubes and chop the broccoli and red bell pepper into bite-sized pieces.
Place the chicken, chickpeas, broccoli, and peppers on the prepared baking sheet.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything together until the ingredients are evenly coated in oil and spices, then spread into a single layer.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden and crisp.
In a small ramekin, whisk together the tahini and lemon juice with a teaspoon of warm water until smooth and pourable.
Transfer the roasted mixture to a bowl and finish by drizzling the creamy tahini sauce over the top.