Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Pat the firm tofu dry with a clean kitchen towel and cut it into 1/2-inch uniform cubes.
Rinse and drain the chickpeas, then pat them thoroughly dry with a paper towel to ensure they become crispy when roasted.
In a large mixing bowl, combine the tofu cubes, chickpeas, and cauliflower florets with the extra virgin olive oil, sea salt, black pepper, garlic powder, and smoked paprika.
Spread the seasoned mixture in a single layer on the prepared baking sheet, ensuring space between pieces for even browning.
Roast in the oven for 25 to 30 minutes, tossing the ingredients halfway through, until the cauliflower is tender and the chickpeas are golden brown.
While the vegetables roast, whisk together the nonfat Greek yogurt and fresh lemon juice in a small bowl until the mixture is smooth and pourable.
To assemble, spread the lemon-yogurt mixture across the bottom of a wide, shallow bowl.
Top the yogurt base with the warm roasted vegetable and tofu mixture, and finish by sprinkling the hemp hearts evenly over the top.