Cook pasta according to package directions. Drain water and set aside to cool.
Chop the grilled chicken breasts into small chunks. In a large bowl toss together chicken, cooked penne pasta, lettuce, cucumber, carrot, green onion, cherry tomatoes, Parmesan cheese and croutons.
Drizzle with desired amount of Caesar salad dressing and toss to coat.
Notes
Reserve dressing on the side if you want to save your leftovers so lettuce doesn't get soggy!