01 - Boil 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 bowl, whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, black pepper, and smoked paprika until smooth and well blended.
03 - Add cooled macaroni, celery, red bell pepper, red onion, and carrots to the dressing. Gently fold together 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 bowl and refrigerate for minimum 1 hour to allow flavors to develop. Stir before serving and adjust seasonings if desired. Serve cold.