Cook the pasta according to box instructions in heavily salted water. For rotini, I boil a 12 oz box for 9-10 minutes. Cook 7-8 minutes if you prefer al dente (firmer pasta).
Chop your remaining ingredients while the pasta is boiling. This includes dicing half a purple onion, 6 pepperoncini (roughly ½ to ¾ cup), 1 ½ cup worth of sliced cherry tomatoes, 1 large bell pepper, 8 oz mozzarella, ½ cup celery, and 2 cups of diced salami.
Drain the pasta and place in a large bowl. Add in your chopped ingredients, 1 cup of pitted kalamata olives, and 1 cup Italian dressing. Mix well until the pasta salad is fully coated with dressing and blended evenly.
Top with chopped parsley, ½ cup grated parmesan cheese, salt and freshly cracked pepper. Allow to cool in the refrigerator for a minimum of 1 hour for the pasta to chill.
Enjoy!