Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Press the extra firm tofu with a heavy object for 10 minutes to remove excess moisture, then cut into half-inch cubes.
In a large bowl, toss the tofu cubes, chickpeas, and broccoli florets with olive oil, sea salt, black pepper, and garlic powder until evenly coated.
Spread the tofu and vegetable mixture in a single layer on the prepared baking sheet.
Roast for 25 minutes, flipping halfway through, until the tofu is golden and the broccoli is tender with charred edges.
While the vegetables roast, whisk the tahini and lemon juice together in a small ramekin, adding a teaspoon of warm water to reach a smooth, pourable consistency.
Place the fresh spinach in a serving bowl and top with the roasted tofu, chickpeas, and broccoli.
Garnish the bowl with nutritional yeast and hemp seeds, then finish by drizzling the creamy tahini dressing over the top.