Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Press the extra firm tofu with a clean kitchen towel to remove excess moisture, then cut into 1/2-inch cubes.
In a large mixing bowl, combine the tofu cubes, chickpeas, and broccoli florets.
Drizzle the mixture with olive oil and sprinkle with sea salt, black pepper, and garlic powder, tossing until evenly coated.
Spread the ingredients in a single layer on the prepared baking sheet and roast for 25 to 30 minutes, tossing halfway through, until the tofu is golden and the broccoli edges are crispy.
Remove from the oven and immediately toss the hot vegetables and tofu with the nutritional yeast until a light crust forms.
In a small bowl, whisk together the tahini and lemon juice, adding a teaspoon of warm water if necessary to reach a pourable consistency.
Transfer the roasted mixture to a serving bowl and finish with the lemon-tahini drizzle.