Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Drain and rinse the canned chickpeas, then pat them completely dry with a clean kitchen towel to ensure they crisp up.
Press the extra firm tofu to remove excess moisture and cut it into uniform 1/2-inch cubes.
Place the chickpeas, tofu cubes, broccoli florets, and sliced red bell pepper onto the prepared baking sheet.
Drizzle with olive oil and sprinkle with nutritional yeast, garlic powder, sea salt, and black pepper, tossing until everything is evenly coated.
Roast in the oven for 25-30 minutes, tossing halfway through, until the tofu is golden and the vegetables are tender.
In a small bowl, whisk together the tahini, lemon juice, and water until the dressing is smooth and pourable.
Transfer the roasted mixture to a bowl and finish by drizzling the lemon-tahini dressing over the top before serving.