Cook the rotini pasta according to package instructions. Drain and rinse under cold water to cool.
In a large bowl, combine the cooled pasta, shredded chicken, corn, cherry tomatoes, red onion, and cheddar cheese.
In a small bowl, whisk together the BBQ sauce and ranch dressing. Pour the mixture over the pasta salad and toss until everything is evenly coated.
Season with salt and pepper to taste.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Before serving, give the salad a good stir and garnish with chopped parsley.