Put on a pot of water to boil for the noodles, and cook according to package directions and set aside.
In a large pan, add tofu and oil, and crumble the tofu with your hands or spatula.
Cook on medium heat for 12 to 15 min, stirring frequently. During last few minutes of cooking, add the dark soy sauce, garlic powder, and onion powder.
While tofu is cooking, whisk together the sauce ingredients.
Once the tofu is quite browned, push the tofu to the side of the pan and add the sauce. Let it thicken somewhat.
Add the noodles and scallions, and stir everything together.
Top with sesame seeds.