Cook pasta according to package directions (add a drop of vegetable oil to the cooking water, optional). Once pasta is tender but firm, strain the pasta and then soak it (in the strainer) in an ice bath to cool it quickly. Remove from water and strain again to remove any water.

Add cooked pasta, spinach, water chestnuts, bean sprouts, carrots and chicken to a large bowl and use tongs to mix together. 

When ready to serve, add the dressing and toss to mix together. Add additional dressing to taste. Top with cilantro and sesame seeds if desired.