Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Slice the chicken breast into 1-inch cubes and place them in a large mixing bowl.
Drain and rinse the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure they become crisp in the oven.
Add the chickpeas and broccoli florets to the bowl with the chicken, then toss with the extra virgin olive oil, sea salt, black pepper, and garlic powder until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet and roast for 18-20 minutes, or until the chicken is cooked through and the broccoli has charred edges.
While the vegetables roast, prepare the dressing by whisking together the tahini, lemon juice, and water in a small ramekin until it reaches a velvety consistency.
To serve, divide the cooked quinoa into bowls and top with the roasted chicken, chickpeas, and broccoli.
Finish by drizzling the creamy lemon-tahini dressing over the top and enjoy immediately.