Preheat your oven to 400 degrees Fahrenheit and line a large baking sheet with parchment paper.
Press the extra firm tofu for 10 minutes to remove excess moisture, then cut into 1-inch cubes.
In a large bowl, toss the tofu, chickpeas, broccoli florets, and sweet potato cubes with olive oil, garlic powder, sea salt, and black pepper.
Sprinkle the nutritional yeast over the tofu and vegetables, tossing again to ensure the tofu is well-coated for a crispy exterior.
Spread the mixture in a single layer on the prepared baking sheet and roast for 25 to 30 minutes, flipping halfway through, until the vegetables are tender and tofu is golden.
While roasting, whisk together the tahini, lemon juice, and water in a small bowl until the dressing is smooth and pourable.
Transfer the roasted mixture to a bowl, sprinkle with hemp seeds, and drizzle the creamy tahini dressing over the top before serving.