Place the potatoes in a large pot and cover with cold water. Bring to a boil over high heat and cook until the potatoes are fork tender, about 10 minutes.
Drain the potatoes and let cool. In a large bowl, combine the mayonnaise, sour cream, mustard, celery, parsley, salt, and pepper. Add the cooled potatoes and stir to combine.
Chill in the refrigerator for at least 1 hour before serving.
Interesting Facts
This delicious potato salad is a great side dish for any summer cookout or picnic.
You can add other vegetables to the potato salad such as diced carrots or red onion.
This potato salad will keep in the refrigerator for up to 3 days.