Cook pasta according to package directions.
While pasta is cooking prep and chop onions, pepper, and cilantro.
To make sauce combine water, bullion, peanut butter, soy sauce, garlic and pepper flakes. Whisk until combined.
Drain pasta and put in a large bowl. Add sauce and peppers, onions, and cilantro and mix well.
Stir in shredded chicken
Chill for minimum 2 hours or overnight.
To serve toss pasta to evenly distribute sauce and serve cold.