Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Press the extra firm tofu between paper towels to remove excess moisture, then cut into uniform 1/2-inch cubes.
In a large mixing bowl, toss the tofu cubes, chickpeas, broccoli florets, and sliced bell peppers with olive oil, smoked paprika, garlic powder, sea salt, and black pepper.
Spread the seasoned mixture in a single layer on the prepared baking sheet and roast for 20-25 minutes, tossing halfway through, until the tofu is golden and vegetables are tender-crisp.
While the vegetables roast, whisk together the nonfat plain Greek yogurt and lemon juice in a small bowl until the dressing is smooth and pourable.
Assemble the Buddha bowl by placing the warm cooked quinoa at the base and topping it with the roasted tofu and vegetable mixture.
Drizzle the creamy lemon-yogurt dressing over the top and finish with a sprinkle of hemp hearts for a final protein boost.