01 - Cook elbow macaroni according to package directions until al dente. Drain thoroughly in a colander and rinse under cold running water to halt cooking. Transfer to a large bowl and let cool completely.
02 - In a medium bowl, whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, black pepper, and smoked paprika until smooth and fully combined.
03 - Add cooled macaroni, diced celery, red bell pepper, red onion, and shredded carrots to the prepared dressing. Gently fold with a spatula until all ingredients are evenly coated.
04 - If using, fold in sweet pickle relish and chopped fresh parsley for additional flavor and color.
05 - Cover the bowl tightly with plastic wrap and refrigerate for at least 1 hour to allow flavors to develop. Stir before serving and adjust seasoning if necessary. Serve cold.