01 - Prepare 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 mixing bowl, combine mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, black pepper, and smoked paprika. Whisk vigorously until completely smooth and well incorporated.
03 - Add cooled macaroni, diced celery, red bell pepper, red onion, and shredded carrots to the dressing. Gently fold all ingredients together until evenly coated with the creamy mixture.
04 - If using, incorporate sweet pickle relish and fresh chopped parsley. Fold gently to distribute throughout the salad for added sweetness and herbaceous notes.
05 - Cover the bowl tightly with plastic wrap or lid. Refrigerate for a minimum of 1 hour to allow flavors to develop and meld. The salad tastes best when thoroughly chilled.
06 - Remove from refrigeration and stir once before serving. Taste and adjust salt or pepper if necessary. Serve cold alongside grilled meats, barbecue dishes, or as part of a picnic spread.