Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Press the firm tofu between paper towels to remove excess moisture, then cut into 1-inch cubes.
Place the tofu, chickpeas, broccoli florets, and sliced bell peppers on the baking sheet and toss with olive oil, garlic powder, oregano, sea salt, and black pepper.
Roast for 25 to 30 minutes, tossing halfway through, until the vegetables are tender and the tofu is golden brown.
While the vegetables roast, whisk the lemon juice and chopped parsley in a small bowl to create the vinaigrette.
Spread the Greek yogurt in a smooth layer across the bottom of a serving bowl.
Pile the roasted vegetable and tofu medley on top of the yogurt.
Finish by drizzling the herb vinaigrette over the dish and sprinkling with hemp hearts before serving.