Boil water in a large pot, add noodles, and cook according to package instructions (4-5 minutes).

In a medium bowl, whisk together peanut butter, soy sauce, chili oil, and rice vinegar until smooth.

Drain the cooked noodles in a colander without rinsing, and return them to the pot.

Pour the peanut sauce over the noodles and mix well.

For creaminess, add 1-2 tablespoons of hot noodle cooking water and mix gently.

Garnish with additional chili oil, cilantro, and green onions before serving.