Boil potatoes in salted water until fork-tender (about 10-12 minutes), then drain and let cool
In a large bowl, whisk together Hellmann’s mayonnaise, mustard, vinegar, salt, and black pepper
Add cooled potatoes, celery, red onion, and hard-boiled eggs to the bowl
Gently fold everything together until evenly coated
Refrigerate for at least 1 hour before serving for the best flavor
Garnish with fresh parsley and a sprinkle of paprika before serving