Heat oven to 350°F. Grease or spray 13x9-inch pan.
In large bowl, place 1 lb. cooked and drained penne pasta, 2 cups shredded cooked chicken, 1 jar (15 oz) Alfredo pasta sauce and 1/2 cup ranch dressing and half of the cheese and half of the bacon. Stir to combine. Pour mixture in pan and spread evenly.
Sprinkled remaining three slices chopped cooked bacon evenly over top, then sprinkle with remaining 1/2 cups shredded mozzarella cheese.
Bake 15 to 20 minutes or until hot and bubbly. Let stand 5 minutes before serving. Sprinkle with chopped parsley.