Cook the rotini pasta according to package instructions until al dente. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooked pasta, shredded chicken, sweet corn, cherry tomatoes, red bell pepper, and red onion.
In a separate small bowl, whisk together the mayonnaise, Greek yogurt, Dijon mustard, apple cider vinegar, garlic powder, salt, and pepper until smooth.
Pour the dressing over the pasta mixture and toss gently to combine, ensuring everything is evenly coated.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Before serving, give the salad a gentle stir and garnish with chopped fresh parsley.