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 bowl, whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, sugar, salt, black pepper, and smoked paprika until completely smooth and well incorporated.
03 - Add cooled macaroni, diced celery, red bell pepper, red onion, and shredded carrots to the dressing. Using a spatula, gently fold ingredients until evenly coated.
04 - If using, incorporate sweet pickle relish and chopped fresh parsley. Fold gently to distribute evenly throughout the salad.
05 - Cover bowl securely and refrigerate for minimum 1 hour, or up to overnight, to allow flavors to develop and dressing to permeate the pasta.
06 - Remove from refrigerator and stir gently to redistribute dressing. Taste and adjust seasoning if necessary. Serve cold alongside grilled meats, barbecued items, or as a standalone dish.