Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Cube the extra firm tofu and sweet potato into bite-sized pieces, then drain and rinse the chickpeas, patting them very dry with a clean towel.
Spread the tofu, sweet potato, and chickpeas onto the baking sheet and toss with olive oil, garlic powder, sea salt, and black pepper.
Roast the mixture for 15 minutes, then remove from the oven to add the broccoli florets to the tray.
Return the tray to the oven and roast for another 10 to 12 minutes until the sweet potatoes are fork-tender and the tofu is golden.
In a small bowl, whisk together the tahini and lemon juice with a teaspoon of warm water until the dressing reaches a smooth, pourable consistency.
Assemble the bowl by layering the roasted vegetables and tofu, then sprinkle the nutritional yeast and hemp seeds over the top.
Finish by drizzling the lemon-tahini sauce over the entire bowl and serve immediately while warm.