01 - Cook elbow macaroni according to package directions until al dente. Drain thoroughly and rinse under cold running water to halt cooking. Transfer to a large bowl and allow to cool completely.
02 - In a separate medium bowl, whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, black pepper, and smoked paprika until smooth and well combined.
03 - Pour the dressing over the cooled macaroni. Add celery, red bell pepper, red onion, and shredded carrots. Using a large spoon or spatula, fold gently until all ingredients are evenly coated.
04 - If using, fold in sweet pickle relish and chopped fresh parsley until distributed throughout the salad.
05 - Cover the bowl tightly with plastic wrap or a lid. Refrigerate for at least 1 hour to allow flavors to meld. Stir once before serving chilled. Adjust salt and pepper to taste if desired.