Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Press the firm tofu for 15 minutes to remove excess moisture, then slice into 1/2-inch uniform cubes.
Chop the carrots, zucchini, and red bell pepper into bite-sized pieces, ensuring they are roughly the same size as the tofu.
Place the tofu and vegetables on the prepared baking sheet, drizzle with olive oil, and sprinkle with sea salt and black pepper.
Roast for 20-25 minutes, tossing halfway through, until the tofu is golden and the vegetables are tender and slightly caramelized.
While the vegetables roast, combine the quinoa and 6 tablespoons of water in a small saucepan; bring to a boil, then reduce heat and simmer covered for 15 minutes.
Remove the quinoa from the heat and let it sit for 5 minutes before fluffing with a fork and stirring in the lemon juice, parsley, and chives.
Transfer the herb-infused quinoa to a bowl and top with the roasted tofu and vegetables, then finish by sprinkling with pumpkin seeds and hemp seeds.