Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Pat the extra firm tofu dry with a clean kitchen towel to remove excess moisture, then cut it into 1-inch cubes.
In a large mixing bowl, combine the cubed tofu, chickpeas, broccoli florets, and sliced red bell pepper.
Drizzle the mixture with olive oil and season with sea salt, black pepper, and garlic powder, tossing until everything is evenly coated.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring they aren't overcrowded to allow for proper browning.
Roast for 25-30 minutes, tossing halfway through, until the tofu is golden and the vegetables are tender with charred edges.
While the vegetables roast, whisk together the tahini and lemon juice in a small bowl, adding a teaspoon of water at a time until it reaches a smooth, drizzling consistency.
Transfer the roasted tofu and vegetable mixture to a serving bowl.
Top with nutritional yeast and hemp seeds for a boost of flavor and protein, then finish by drizzling the lemon-tahini sauce over the top.