These 5 ingredients seem to work well:
- Peanut butter
- Soy sauce
- small dab of sesame oil
- fish sauce
- oyster sauce
sprinkle the whole thing with fried shallots.
Source:
https://mylovelyrecipes.com/recipes/chinese-cuisine/chee-cheong-fun/
https://www.youtube.com/watch?v=CHFkdGCHMQU