Miso paste, dashi powder, chicken buillion powder, sesame oil, soy sauce, chili powder or oil, and a raw egg.
Mix well, combine with noodles reserving cooking water. Mix to thoroughly coat noodles. Add reserved cooking water to desired consistency.
You can skip or adjust any ingredients as you prefer. It is easy to make it too salty though. I would say it is most important to keep the egg in there. It helps get the consistency and thickness of a proper broth.