Prepare rice noodles as directed on package. Rinse under cold water; drain well. Set aside.
Place peanut butter, broth, sherry, chives, fish sauce, sugar and sesame oil in bowl of food processor; cover. Process until smooth. Set aside.
Heat vegetable oil in large skillet or wok on medium heat. Add vegetables; stir fry 3 to 4 minutes or until tender-crisp. Stir in peanut butter mixture. Bring to simmer. Add noodles; toss to coat. Spoon noodle mixture into serving bowls. Sprinkle with peanuts or sesame seed, if desired