Combine peanut butter, yogurt, sugar, soy sauce, sesame oil, garlic and red pepper in blender container and blend until smooth.
Cook noodles al dente according to package directions. Drain and rinse with cold water. Drain again thoroughly.
Combine noodles and sesame oil and toss. Pour on the Szechwan Peanut Sauce and gently but thoroughly mix. Refrigerate until cold. Serve cold, topped with sliced green onion.
