Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Press the extra firm tofu between paper towels for 15 minutes to remove excess moisture, then cut into 1-inch cubes.
In a large mixing bowl, toss the tofu cubes, rinsed chickpeas, and broccoli florets with the olive oil, garlic powder, sea salt, and black pepper until evenly coated.
Spread the vegetable and tofu mixture in a single layer on the prepared baking sheet and roast for 25 to 30 minutes, tossing halfway through, until the tofu is golden and the chickpeas are slightly crisp.
While the vegetables roast, prepare the dressing by whisking together the tahini, nutritional yeast, lemon juice, and water in a small bowl until the consistency is smooth and pourable.
To assemble, place the warm cooked quinoa in the base of a bowl, top with the roasted tofu and vegetable medley, and finish with a generous drizzle of the lemon-tahini dressing.