01 - Place the cubed potatoes in a large pot and fill with cold water just to cover. Add 1 tablespoon salt and bring to a boil over high heat. Reduce to a simmer and cook for 10 to 12 minutes until potatoes are fork-tender. Drain thoroughly and allow to cool slightly.
02 - While the potatoes cook, fry chopped beef bacon in a large skillet over medium heat, stirring occasionally, until evenly crisp. Transfer bacon to a paper towel-lined plate and reserve some for garnish.
03 - In a large mixing bowl, whisk together the sour cream, mayonnaise, Dijon mustard, and black pepper until smooth.
04 - Add the warm, drained potatoes to the bowl with the dressing and gently fold to thoroughly coat.
05 - Gently mix in the celery, sliced green onions, shredded sharp cheddar cheese, chopped parsley, and most of the cooked beef bacon. Stir until the salad is well combined.
06 - Season the salad with additional salt and black pepper as needed, adjusting to taste.
07 - Transfer potato salad to a serving platter or bowl. Top with reserved green onions, reserved beef bacon, and extra chopped parsley for garnish.
08 - Serve the salad warm, at room temperature, or chilled depending on preference.