Preheat oven to 400°F and line a large baking sheet with parchment paper.
Press the tofu between paper towels to remove excess moisture, then cut into 1-inch cubes.
In a large bowl, toss the tofu, chickpeas, and broccoli florets with the garlic powder, sea salt, black pepper, and nutritional yeast until everything is evenly coated.
Spread the mixture in a single layer on the prepared baking sheet and roast for 25-30 minutes, tossing halfway through, until the tofu is golden and the broccoli is slightly charred.
While the vegetables roast, whisk together the tahini and lemon juice in a small bowl, adding a splash of water if needed to reach a drizzling consistency.
Transfer the roasted ingredients to a bowl, sprinkle with hemp seeds for a nutty crunch, and finish with the lemon-tahini dressing.