Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Drain the extra firm tofu and press it firmly between paper towels to remove excess moisture, then cut into 1/2-inch cubes.
In a large mixing bowl, combine the tofu cubes, chickpeas, broccoli florets, and sliced bell peppers.
Drizzle with avocado oil and season with sea salt, black pepper, and garlic powder, tossing well to ensure everything is evenly coated.
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 and the vegetables are tender.
While the vegetables roast, whisk together the lemon juice and tahini in a small bowl, adding a teaspoon of warm water if needed to reach a drizzling consistency.
Transfer the roasted vegetables and tofu to a serving bowl.
Top with nutritional yeast and hemp hearts, then finish with the lemon-tahini drizzle before serving.