Boil a noodle of your choice until al dente and reserve some of the noodle water.
In a bowl, combine peanut butter, soy sauce, vinegar, sesame oil, garlic, sugar, sriracha, and a splash of noodle water. Mix thoroughly until smooth and creamy.
Add your noodles to the sauce and toss until every strand is evenly coated.
Serve in a bowl and optionally garnish with chili flakes, sesame seeds, and scallions.
