Bring a large pot of lightly salted water to a boil.
Add the corkscrew-shaped pasta to the boiling water.
Cook the pasta according to the package directions, stirring occasionally, until it is tender but still firm to the bite.
Drain the cooked pasta thoroughly.
Rinse the pasta under cold water to stop the cooking process and cool it for the salad.
Allow the pasta to drain well to remove any excess water.
In a large mixing bowl, combine the Italian-style salad dressing and mayonnaise.
Whisk the dressing and mayonnaise together until smooth and fully blended.
Add the chopped cooked rotisserie chicken to the dressing mixture.
Add the crumbled crispy bacon, cubed Muenster cheese, chopped celery, chopped green bell pepper, and halved cherry tomatoes.
Stir gently until the ingredients are evenly coated with the dressing.
Add the cooled pasta to the bowl.
Toss gently until the pasta is fully incorporated and coated with the dressing mixture.
Add the chopped avocado last.
Fold the avocado gently into the pasta salad to prevent it from becoming mashed.
Cover and refrigerate the pasta salad until ready to serve, if desired.
Stir gently before serving.
Serve chilled.