Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Press the extra firm tofu with a heavy object for 10 minutes to remove excess moisture, then cut into 1-inch cubes.
In a large mixing bowl, combine the tofu cubes, chickpeas, broccoli florets, and sliced bell peppers.
Drizzle with olive oil and sprinkle with sea salt, black pepper, and garlic powder, tossing well to ensure everything is evenly coated.
Spread the mixture in a single layer on the prepared baking sheet and roast for 25 minutes, flipping halfway through, until the tofu is golden and the vegetables are tender.
While the vegetables roast, whisk together the nutritional yeast, tahini, lemon juice, and water in a small bowl until a smooth, pourable dressing forms.
Transfer the roasted tofu and vegetables to a serving bowl, drizzle with the nutritional yeast dressing, and sprinkle with hemp hearts before serving.