Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Pat the chicken breast dry with paper towels and cut into 1-inch bite-sized pieces.
Rinse and drain the canned chickpeas, then pat them very dry with a clean kitchen towel to ensure maximum crispiness.
Place the chicken, chickpeas, broccoli florets, and chopped red bell pepper onto the prepared baking sheet.
Drizzle the olive oil over the ingredients and sprinkle evenly with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything together with your hands or a spatula until well coated, then spread into a single, even layer.
Roast in the oven for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden and crisp.
While roasting, whisk the tahini and lemon juice in a small bowl, adding a teaspoon of warm water at a time until it reaches a smooth, drizzling consistency.
Transfer the roasted chicken and vegetables to a serving bowl and finish by drizzling the creamy tahini dressing over the top.