01 - Place peeled and cubed potatoes in a large pot, add enough cold water to cover, then add 1 tablespoon salt. Bring to a boil, reduce heat, and simmer for 10 to 12 minutes, or until potatoes are fork-tender. Drain using a colander and allow to cool slightly.
02 - While potatoes cook, fry chopped beef bacon in a large skillet over medium heat until crispy. Transfer to a paper towel-lined plate to remove excess grease.
03 - In a large mixing bowl, whisk together sour cream, mayonnaise, Dijon mustard, and black pepper until smooth.
04 - Add warm, drained potatoes to the dressing. Gently fold until potatoes are evenly coated.
05 - Sprinkle in celery, most of the green onions, sharp cheddar cheese, parsley, and most cooked beef bacon. Gently toss until the mixture is thoroughly combined.
06 - Season with additional salt and black pepper to taste. Mix lightly to avoid breaking apart the potatoes.
07 - Transfer to a large serving platter or bowl. Garnish with reserved green onions, remaining beef bacon, and extra parsley as desired. Serve warm, at room temperature, or chilled.