Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast into 1-inch cubes and place them in a large mixing bowl.
Rinse and drain the chickpeas, then pat them very dry with a paper towel to ensure they get crispy.
Chop the broccoli into small florets and slice the red bell pepper into bite-sized pieces.
Add the chickpeas, broccoli, and bell peppers to the bowl with the chicken.
Drizzle with olive oil and sprinkle with sea salt, black pepper, garlic powder, and cumin, tossing until everything is evenly coated.
Spread the mixture in a single layer on the prepared baking sheet and roast for 20 to 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 until creamy.
Transfer the roasted chicken and vegetables to a serving bowl and drizzle with the zesty tahini dressing before serving.