Preheat oven to 400°F and line a large baking sheet with parchment paper.
Press the extra firm tofu with a heavy object for 10 minutes to remove moisture, then cut into half-inch cubes.
In a large mixing bowl, combine the chickpeas, tofu cubes, broccoli florets, and sliced bell peppers.
Drizzle with olive oil and sprinkle with garlic powder, smoked paprika, sea salt, and black pepper, tossing well to coat.
Spread the vegetables and tofu in a single layer on the prepared baking sheet and roast for 25 minutes until the edges are golden.
While roasting, whisk together the tahini, nutritional yeast, and lemon juice in a small bowl, adding a teaspoon of water if needed to thin the dressing.
Divide the roasted mixture into bowls and drizzle the creamy tahini dressing over the top before serving.