In mixing bowl, toss cooked noodles with a splash of sesame oil. Set aside.
In a medium bowl, whisk together the remaining 2 tablespoons sesame oil, the soy sauce, rice vinegar, sesame paste, peanut butter, sugar, ginger, garlic and chili-garlic paste.
Pour the sauce over the noodles and toss. Transfer to a serving bowl, and garnish with peanuts.