01 - Place potatoes in a large pot. Fill with cold water to cover, add 1 tablespoon salt, and bring to a boil. Reduce heat and simmer for 10 to 12 minutes or until potatoes are fork-tender. Drain and allow to cool slightly.
02 - While potatoes cook, fry chopped beef bacon in a large skillet over medium heat until crisp. Transfer to a paper towel-lined plate to drain excess fat.
03 - In a large mixing bowl, whisk together sour cream, mayonnaise, Dijon mustard, and black pepper until smooth.
04 - Add the warm, drained potatoes to the dressing. Gently fold to coat the potatoes evenly.
05 - Add celery, green onions, shredded cheddar cheese, chopped parsley, and most of the cooked beef bacon, reserving some for garnish. Gently combine all ingredients until well mixed.
06 - Season with additional salt and pepper to taste, mixing gently.
07 - Transfer salad to a serving platter or bowl. Garnish with reserved green onions, crispy beef bacon, and extra parsley as desired. Serve warm, at room temperature, or chilled.