Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Press the extra firm tofu with a heavy object for 10 minutes to remove excess moisture, then cut into 1/2-inch uniform cubes.
In a large mixing bowl, combine the tofu cubes, chickpeas, broccoli florets, and chopped red bell pepper.
Drizzle the mixture with olive oil and sprinkle with sea salt, black pepper, and garlic powder, tossing well to ensure everything is evenly coated.
Spread the ingredients in a single layer on the prepared baking sheet and roast for 25 minutes, tossing halfway through, until the tofu is golden and the vegetables are tender.
While the bowl components roast, whisk together the tahini, lemon juice, and tamari in a small bowl until the dressing is smooth and creamy.
Transfer the roasted tofu and vegetables to a serving bowl, sprinkle with nutritional yeast and hemp seeds, and finish with the lemon-tahini drizzle.