Wrap the extra firm tofu in a clean kitchen towel and place a heavy skillet on top to press out excess moisture for 15 minutes.
Cut the pressed tofu into 1-inch cubes and place them in a medium bowl.
Sprinkle the cornstarch, nutritional yeast, sea salt, and black pepper over the tofu, tossing gently until each cube is evenly coated.
Heat the toasted sesame oil in a large non-stick skillet over medium-high heat.
Add the tofu cubes to the skillet in a single layer and cook for 8-10 minutes, turning occasionally, until all sides are golden and crispy.
Push the tofu to one side of the pan and add the sliced bell peppers, minced garlic, and grated ginger to the empty space.
Sauté the vegetables for 3-4 minutes until the peppers are tender-crisp and fragrant.
Stir in the shelled edamame and tamari, tossing everything together for 2 minutes until heated through.
Sprinkle with sesame seeds before serving warm.