Preheat oven to 400°F and line a baking sheet with parchment paper.
Press the extra firm tofu to remove excess moisture, then cut into 0.5-inch cubes.
In a large bowl, toss the tofu, chickpeas, and broccoli florets with olive oil, sea salt, black pepper, and garlic powder.
Spread the mixture in a single layer on the prepared baking sheet.
Roast for 22 minutes, tossing halfway through, until the tofu is golden and the broccoli is tender.
While roasting, whisk together the nutritional yeast, water, and lemon juice in a small bowl to create a thick dressing.
Transfer the roasted mixture to a bowl, drizzle with the dressing, and top with hemp seeds.