01 - Boil 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 let 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 blended.
03 - Add cooled macaroni to the dressing along with diced celery, red bell pepper, red onion, and shredded carrots. Fold gently to coat all ingredients evenly with the creamy mixture.
04 - If using, stir in sweet pickle relish and chopped fresh parsley for additional flavor and color.
05 - Cover bowl tightly with plastic wrap or lid. Refrigerate for at least 1 hour to allow flavors to meld. Stir before serving and adjust seasoning if desired. Serve cold.