01 - Place cubed potatoes in a large pot and cover with cold, salted water. Bring to a boil over medium-high heat. Reduce heat and simmer for 10–12 minutes until potatoes are fork-tender.
02 - Drain potatoes thoroughly and spread on a baking sheet. Let cool for 10 minutes to prevent dressing from separating.
03 - In a large mixing bowl, whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, salt, and pepper until completely smooth and emulsified.
04 - Add cooled potatoes, celery, red onion, parsley, and chives to the bowl. Gently fold to coat evenly with dressing, being careful not to break up potato pieces.
05 - Fold in chopped hard-boiled eggs. Taste and adjust salt and pepper as needed.
06 - Cover bowl and refrigerate for at least 1 hour to allow flavors to meld. Garnish with additional fresh herbs before serving.