Remove the tofu from its package and let it drain in a colander or on its side in a bowl
Combine the green onions and garlic in a small bowl. Add the soy sauce, sesame oil, sesame seeds, and chili powder and mix
Cut the tofu cube lengthwise in half, then cut into 1/2-inch-thick slices
Heat the vegetable oil in a large skillet over high heat. Carefully place the tofu slices in the skillet. Cook until the tofu is slightly browned on the bottom and getting a bit crispy on the edges, 4 to 5 minutes. Turn the slices over and brown the other side
Reduce the heat and spoon the seasoning over the tofu, distributing it somewhat evenly. Cover an let steam for 2 to 3 minutes. Transfer to a plate and serve immediately
Notes
VARIATION: If you like a little kick to the dish, finely chop 1/2 jalapeno (remove the seeds if you want to) and add it to the soy mixture