01 - Place potatoes in a large pot and cover with cold salted water. Bring to a boil, reduce heat, and simmer for 10 to 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. Cool under cold running water, peel, and chop.
03 - Combine mayonnaise, sour cream, Dijon mustard, vinegar, sugar, salt, and black pepper in a large bowl. Whisk until smooth.
04 - Add cooked potatoes, chopped eggs, celery, red onion, pickles, and chives to the dressing. Gently fold together until evenly coated.
05 - Taste and adjust seasoning as needed. Cover and refrigerate for at least one hour to allow flavors to meld.
06 - Serve chilled, optionally garnished with additional chives or a sprinkle of paprika.