01 - Place the 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, or until potatoes are just fork-tender.
02 - Drain the potatoes and spread them out 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.
04 - Add the cooled potatoes, celery, red onion, parsley, and chives to the bowl. Gently toss to coat all ingredients with the dressing.
05 - Fold in the chopped hard-boiled eggs. Taste and adjust seasoning as needed.
06 - Cover and refrigerate for at least 1 hour before serving to allow flavors to meld. Garnish with additional herbs before serving, if desired.