Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Press the extra firm tofu with a heavy object for 10 minutes to remove excess moisture, then cut into 1/2-inch cubes.
In a large mixing bowl, combine the tofu cubes, broccoli florets, and cauliflower florets.
Drizzle with olive oil and sprinkle with garlic powder, turmeric, sea salt, black pepper, and 2 tablespoons of the nutritional yeast.
Toss the mixture until every piece is evenly coated, then spread in a single layer on the prepared baking sheet.
Roast for 25 minutes, flipping halfway through, until the tofu is golden and the vegetables are tender with slightly browned edges.
While the vegetables roast, prepare the dressing by whisking together the tahini, lemon juice, the remaining tablespoon of nutritional yeast, and 1 tablespoon of warm water until smooth and velvety.
Place the chopped kale in a serving bowl and massage it with a tiny squeeze of lemon for 30 seconds until it softens.
To assemble, top the kale with the warmed cooked lentils and the roasted tofu and vegetable mixture.
Finish the bowl by garnishing with hemp seeds and drizzling the prepared tahini sauce over the top.