Preheat oven to 400°F (200°C).
Press the extra firm tofu for 10 minutes to remove excess water, then cut into 1/2-inch cubes.
Drain and rinse the chickpeas, then pat them dry with a towel to ensure they get crispy.
In a large bowl, toss the tofu, chickpeas, and broccoli florets with olive oil, nutritional yeast, salt, and pepper.
Spread the mixture in a single layer on a parchment-lined baking sheet.
Roast for 20-25 minutes, tossing halfway through, until the tofu is golden and chickpeas are crunchy.
Prepare the dressing by whisking together tahini, lemon juice, and a tablespoon of warm water until smooth and pourable.
Place the warm cooked brown rice in a bowl and top with the roasted tofu and vegetable mixture.
Drizzle with the lemon tahini sauce and serve immediately.