01 - Place potatoes in a large pot and cover with cold salted water. Bring to a boil, reduce heat, and simmer for 10–15 minutes until just tender. Drain and let cool slightly.
02 - Place eggs in a saucepan, cover with cold water, and bring to a boil. Once boiling, cover and remove from heat. Let stand for 10 minutes, then cool under cold running water, peel, and chop.
03 - In a large mixing bowl, whisk together mayonnaise, sour cream, Dijon mustard, vinegar, sugar, salt, and black pepper until smooth.
04 - Add the cooked potatoes, eggs, celery, red onion, pickles, and chives to the bowl. Gently fold everything together until evenly coated.
05 - Taste and adjust seasoning if necessary. Cover and chill for at least 1 hour before serving to allow flavors to meld.
06 - Serve cold, garnished with extra chives or paprika if desired.