Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the chicken breast into bite-sized 1-inch cubes and place them on the baking sheet.
Add the rinsed chickpeas and broccoli florets to the sheet with the chicken.
Drizzle the olive oil over the ingredients and sprinkle with sea salt, black pepper, garlic powder, and smoked paprika.
Toss everything thoroughly with your hands or a spatula to ensure an even coating of oil and spices.
Spread the mixture into a single layer and roast for 18 to 20 minutes, or until the chicken is cooked through and the broccoli edges are slightly charred.
While roasting, whisk together the lemon juice and tahini in a small bowl until smooth.
Transfer the roasted mixture to a bowl, drizzle with the lemon-tahini dressing, and serve immediately.