Bring a large pot of lightly salted water to a boil. Add penne pasta and cook for 8 to 10 minutes or until al dente; drain.
Melt butter in a large skillet over medium heat.Add chicken, pepper and salt.Cook 10 minutes or until chicken is cooked through.Remove skillet from heat.
In a bowl, mix together salad dressing, vinegar and cheese.Toss together pasta, chicken, lettuce, and dressing mixture.Place in large serving bowl, and sprinkle with tomato.Garnish with croutons and Parmesan curls, if desired.
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