01 - Bring a large pot of salted water to a boil. Add the halved baby potatoes and cook until fork-tender, about 15 to 20 minutes. Drain and allow to cool slightly.
02 - In a mixing bowl, whisk together sour cream, mayonnaise, Dijon mustard, apple cider vinegar, garlic powder, onion powder, salt, and pepper until smooth and well combined.
03 - Transfer the slightly cooled potatoes to a large bowl. Add the sliced scallions and most of the finely chopped chives, reserving a small portion for garnish.
04 - Pour the prepared dressing over the potato mixture and gently toss until all ingredients are evenly coated.
05 - Sprinkle with the reserved chives. Serve immediately, or refrigerate for at least 1 hour to develop flavor before serving.