Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Press the extra firm tofu with a clean kitchen towel or paper towels to remove as much moisture as possible, then cut into 1/2-inch cubes.
In a large mixing bowl, combine the tofu cubes, chickpeas, broccoli florets, and chopped bell pepper.
Drizzle with olive oil and sprinkle with garlic powder, sea salt, and black pepper, tossing well to ensure everything is evenly coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the tofu and vegetables aren't overcrowded.
Roast for 25 to 30 minutes, tossing the ingredients halfway through, until the tofu is golden and the vegetables are tender with slightly charred edges.
Remove from the oven and immediately sprinkle the nutritional yeast over the hot ingredients, tossing gently to coat.
Transfer to a bowl and drizzle with fresh lemon juice before serving.