Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch cubes and slice the bell peppers and zucchini into bite-sized pieces.
Rinse and drain the chickpeas, then pat them dry with a paper towel to ensure they get crispy.
In a large bowl, toss the chicken, chickpeas, peppers, and zucchini with olive oil, sea salt, black pepper, garlic powder, and smoked paprika until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet and roast for 20-25 minutes, or until the chicken is cooked through and the vegetables are tender.
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.
Divide the roasted mixture into bowls and finish with the lemon-tahini drizzle before serving.