Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Pat the chicken breast and chickpeas very dry with paper towels to ensure they roast properly rather than steam.
Cut the chicken into bite-sized cubes and place them on the baking sheet along with the chickpeas and broccoli florets.
Drizzle the olive oil over the mixture and sprinkle with cumin, smoked paprika, garlic powder, sea salt, and black pepper.
Toss everything together until evenly coated, then spread into a single layer and roast for 20-22 minutes.
While the bowl base roasts, whisk together the Greek yogurt, tahini, and lemon juice in a small bowl until the dressing is smooth.
Transfer the roasted chicken and vegetables to a bowl and drizzle with the creamy lemon-tahini dressing before serving.