Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Press the extra firm tofu with a clean towel to remove excess moisture, then cut into 1/2-inch cubes.
Drain and rinse the chickpeas, patting them very dry with a paper towel to ensure they crisp up in the oven.
In a large mixing bowl, combine the tofu, chickpeas, broccoli florets, and sliced bell pepper.
Drizzle with olive oil and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper, tossing thoroughly to coat.
Spread the vegetables and protein in a single layer on the prepared baking sheet and sprinkle evenly with the nutritional yeast.
Roast for 25 to 30 minutes, tossing the ingredients halfway through, until the broccoli is tender-crisp and the tofu is golden.
While the bowl base roasts, whisk together the nonfat Greek yogurt and lemon juice in a small bowl until smooth and creamy.
Divide the roasted vegetable mixture into bowls and finish with a generous drizzle of the lemon-yogurt sauce.