01 - Combine potatoes and 1 tablespoon salt in a large pot, cover with cold water, and bring to a boil. Lower heat and simmer for 10 to 12 minutes, until fork-tender. Drain and allow to cool slightly.
02 - While potatoes are cooking, fry the chopped beef bacon over medium heat in a large skillet until crisp. Drain bacon on a paper towel-lined plate.
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 bowl with dressing. Gently fold to coat the potatoes evenly.
05 - Gently mix in finely diced celery, sliced green onions (reserving some for garnish), shredded cheddar cheese, chopped parsley, and most of the cooked beef bacon. Reserve a portion of bacon for garnish.
06 - Season the salad with additional salt and black pepper to taste.
07 - Transfer to a serving bowl or platter. Garnish with reserved green onions, crispy beef bacon, and extra parsley.
08 - Serve warm, at room temperature, or chilled as preferred.