For dressing, in a screw-top jar combine Asian dressing and peanut butter. Cover and shake well, adding 1 to 2 tablespoons water if necessary to reach desired consistency.
In a large bowl combine cabbage, green onions, and sesame seeds. Break noodles into small pieces (save seasoning packet for another use) and add to cabbage mixture. Drizzle with dressing; toss gently to coat. Cover and chill for 30 minutes to 2 hours. Sprinkle with peanuts.