Cut the cheddar cheese into small cubes and set aside.
Cook the pasta according to package directions, then rinse with cold water until noodles are cooled.
Add the cooled noodles to a large bowl and stir in the Italian dressing.
Now add the cubed cheddar cheese, pepperoni and shredded parmesan cheese, and toss.
Serve right away, or cover and chill until ready to serve. If chilling first, stir together again before serving.
Notes
Storage: Store in an airtight container in the refrigerator for up to 3-4 days, stirring and adding a splash of extra dressing before serving if needed.