Preheat oven to 400°F and line a large baking sheet with parchment paper.
Press the extra firm tofu with a clean towel to remove excess moisture, then cut into 1-inch cubes.
In a large bowl, toss the tofu cubes, 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 and roast for 25 minutes, flipping halfway through, until the tofu is golden.
Remove from the oven and immediately toss the roasted ingredients with the nutritional yeast while still hot to create a savory coating.
In a small ramekin, whisk together the tahini and lemon juice with a splash of water to reach a pourable consistency.
Transfer the roasted vegetable and protein mix to a bowl and finish with the creamy tahini drizzle.