Put the noodles in a large bowl and cover with boiling water; let stand 10 minutes. Drain and rinse under cold running water. Wipe out the bowl; return the noodles to the bowl.
Puree the peanut butter, fish sauce, lime juice, ginger and 1/3 cup water in a blender until smooth. Pour the dressing over the noodles; toss to coat.
Top each serving of noodles with the chicken, cucumber, carrots, pea shoots, jalapeno and herbs. Toss just before serving.
Photograph by Ryan Dausch