01 - Place potatoes in a large pot, cover with cold water, add 1 tablespoon salt, and bring to a boil. Reduce heat and simmer for 10-12 minutes until fork-tender. Drain and cool slightly.
02 - While potatoes cook, fry chopped beef bacon in a large skillet over medium heat until crispy. Transfer to a plate lined with paper towels to drain excess fat.
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 the dressing. Gently fold to evenly coat the potatoes.
05 - Incorporate celery, green onions, cheddar cheese, parsley, and most of the beef bacon (save some for garnish) into the potato mixture. Gently mix until thoroughly combined.
06 - Adjust seasoning with additional salt and pepper according to taste.
07 - Transfer the salad to a serving platter or bowl. Garnish with reserved green onions, beef bacon, and extra parsley.
08 - Serve warm, at room temperature, or chilled as preferred.