Bring a large pot of salted water to a rolling boil. Add the rotini pasta and cook according to package instructions, about 10-11 minutes. Drain and rinse under cold water.

In a large mixing bowl, combine Italian dressing, lemon juice, and grated Parmesan. Add parsley, garlic powder, kosher salt, black pepper, and onion powder. Whisk until well blended.

Gently add cooled pasta to the dressing mixture and stir until evenly coated.

Serve immediately or cover and refrigerate for at least 2 hours to enhance flavors.