Bring some water to a boil, add chicken breast and cook for 20 minutes, or until no longer pink in middle.
While chicken is cooking, bring a second pot of salted water to boil, add pasta shells and cook until al dente (about 11-13 minutes).
Once pasta and chicken are done, drain and set both aside to cool.
While they are cooling, combine all ingredients listed under the filling section into a bowl.
In a separate bowl, combine all ingredients listed under dressing, whisk until blended.
Chop chicken and add to bowl with filling, mix.
Pour dressing into chicken bowl, mix.
Take a spoon full of the chicken mixture and add it to each jumbo pasta shell.
Serve!