Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Drain and press the extra firm tofu for at least 15 minutes to remove excess moisture, then cut into 1/2-inch cubes.
Place the cubed tofu, chickpeas, and diced sweet potato onto the prepared baking sheet.
Drizzle with olive oil and sprinkle with garlic powder, sea salt, and black pepper, tossing until evenly coated.
Roast for 25-30 minutes, tossing halfway through, until the sweet potatoes are tender and the tofu is golden and slightly crisp.
Remove from the oven and immediately toss the roasted mixture with nutritional yeast while still hot to ensure it adheres.
Place the baby spinach in a large serving bowl and top with the roasted tofu, chickpeas, and sweet potato.
Whisk the lemon juice and hemp seeds together in a small ramekin, then drizzle over the bowl before serving.