Begin by boiling a large pot of salted water. Add rotini pasta and cook according to the package instructions, typically about 10-11 minutes, until al dente. Once cooked, drain the pasta in a colander, and rinse it under cold running water until cool to stop the cooking process.

In a spacious mixing bowl, combine the Italian dressing with freshly squeezed lemon juice, grated Parmesan cheese, and chopped parsley. Add garlic powder, kosher salt, black pepper, and onion powder to enhance the flavor. Whisk everything together until the ingredients are thoroughly blended.

Once your rotini pasta has cooled, transfer it into the bowl with the prepared dressing. Gently stir the pasta into the dressing mixture, ensuring every piece is well-coated and infused with flavor.

For the best flavor experience, cover the bowl with plastic wrap and refrigerate the Lemon Parmesan Pasta Salad for at least 2 hours. Before serving, give the salad a quick stir to recoat the pasta with any dressing that may have settled.