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 fork-tender.
02 - Drain potatoes thoroughly and spread on a baking sheet to cool for 10 minutes.
03 - In a large mixing bowl, whisk together mayonnaise, sour cream, Dijon mustard, apple cider vinegar, salt, and pepper until smooth and creamy.
04 - Add cooled potatoes, celery, red onion, parsley, and chives to the bowl. Gently toss to coat all ingredients evenly with dressing.
05 - Fold in chopped hard-boiled eggs. Taste and adjust seasoning with additional salt and pepper if needed.
06 - Cover bowl and refrigerate for at least 1 hour to allow flavors to meld together before serving.
07 - Garnish with additional fresh herbs if desired and serve chilled.