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 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 bacon to a paper towel-lined plate to remove 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. Gently fold potatoes with the dressing to coat evenly.
05 - Add celery, green onions, cheddar cheese, parsley, and most of the cooked beef bacon to the bowl. Reserve some green onions and bacon for garnish. Gently mix until thoroughly combined.
06 - Season salad with additional salt and pepper to taste, adjusting as needed.
07 - Transfer to a serving platter or bowl. Garnish with reserved beef bacon, green onions, and extra parsley. Serve warm, at room temperature, or chilled as desired.