01 - Prepare elbow macaroni according to package directions until al dente. Drain thoroughly and rinse under cold water to halt cooking. Transfer to a large bowl and allow to cool completely.
02 - Whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, black pepper, and smoked paprika in a separate bowl until fully incorporated and smooth.
03 - Add cooled macaroni, celery, red bell pepper, red onion, and carrots to the dressing. Gently fold together until all components are evenly coated.
04 - If using, fold in sweet pickle relish and chopped fresh parsley for additional flavor and visual appeal.
05 - Cover bowl and refrigerate for at least 1 hour to allow flavors to meld. Stir before serving and adjust seasoning as needed. Serve cold.