Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Press the firm tofu between paper towels to remove excess moisture, then cut into 1/2-inch cubes.
In a large mixing bowl, combine the tofu cubes, drained chickpeas, and broccoli florets.
Drizzle the olive oil over the mixture and season with sea salt, black pepper, and garlic powder.
Add 2 tablespoons of the nutritional yeast to the bowl and toss everything together until the ingredients are evenly coated.
Spread the mixture in a single layer on the prepared baking sheet and roast for 25-30 minutes, flipping halfway through, until the tofu is golden and the broccoli is slightly charred.
While the bowl components are roasting, whisk together the tahini, lemon juice, water, and the remaining 1 tablespoon of nutritional yeast in a small bowl until smooth.
Transfer the roasted vegetables and protein to a serving bowl and drizzle with the creamy tahini sauce before serving.