Drain the extra firm tofu and press it between paper towels for 10 minutes to remove excess moisture, then cut into bite-sized cubes.
Set up a steamer basket over a pot with 2 inches of simmering water.
Place the sliced carrots and broccoli florets into the steamer basket, cover, and steam for 3 minutes.
Add the tofu cubes, snap peas, and shelled edamame to the basket, then cover and continue steaming for 5-6 minutes until the vegetables are tender-crisp.
While the vegetables steam, whisk together the coconut aminos, garlic powder, ginger powder, sea salt, and black pepper in a small bowl.
Carefully transfer the steamed tofu and vegetable medley into a large mixing bowl and drizzle with the prepared sauce, tossing gently to coat.
Divide the mixture into bowls and top with the sliced avocado and a dusting of nutritional yeast before serving.