01 - Prepare 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 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 fully incorporated and smooth.
03 - Add cooled macaroni, diced celery, red bell pepper, red onion, and shredded carrots to the dressing. Using a rubber spatula, fold ingredients gently until evenly coated with the creamy mixture.
04 - If using, incorporate sweet pickle relish and chopped fresh parsley. Fold gently to distribute evenly throughout the salad.
05 - Cover the bowl tightly with plastic wrap or lid. Refrigerate for minimum 1 hour to allow flavors to develop and meld. Before serving, give the salad a final stir and adjust seasoning if necessary. Serve cold.