Cook the rotini pasta according to package instructions. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooled pasta, shredded chicken, corn, crumbled bacon, cherry tomatoes, and red onion.
In a separate small bowl, whisk together the mayonnaise, Dijon mustard, apple cider vinegar, garlic powder, salt, and pepper until smooth.
Pour the dressing over the pasta mixture and toss until everything is well coated.
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.