Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized cubes and pat them dry with a paper towel.
Rinse and drain the chickpeas, then pat them thoroughly dry to ensure they become crispy during roasting.
Place the chicken, chickpeas, broccoli florets, and sliced red bell pepper onto the prepared baking sheet.
Drizzle the olive oil over the ingredients and sprinkle with sea salt, black pepper, smoked paprika, and garlic powder.
Toss everything together until the chicken and vegetables are evenly coated in oil and spices, then spread into a single layer.
Roast in the oven for 20 to 25 minutes, or until the chicken is cooked through and the chickpeas are golden and slightly crisp.
While roasting, whisk together the tahini and lemon juice in a small bowl, adding a teaspoon of warm water at a time until a pourable consistency is reached.
Transfer the roasted chicken and vegetable mixture to a serving bowl and drizzle the zesty tahini sauce over the top before serving.