01 - Place the diced potatoes in a large pot, cover with cold water, and add 1 tablespoon kosher salt. Bring to a boil over high heat, then simmer for 10 to 12 minutes until the potatoes are fork-tender. Drain and allow to cool slightly.
02 - While potatoes are cooking, fry the chopped beef bacon in a large skillet over medium heat until golden and crisp. Drain bacon on paper towels and reserve a portion for garnishing.
03 - In a spacious mixing bowl, whisk together sour cream, mayonnaise, Dijon mustard, and black pepper until smooth and incorporated.
04 - Add the slightly warm, drained potatoes to the bowl with the dressing. Gently fold with a spatula or spoon to coat the pieces evenly.
05 - Mix in the diced celery, sliced green onions, shredded cheddar cheese, chopped parsley, and most of the cooked beef bacon. Combine gently until the mixture is cohesive.
06 - Adjust seasoning with additional salt and pepper as needed to suit taste preferences.
07 - Transfer the salad to a serving bowl or platter. Sprinkle reserved green onions, bacon, and extra parsley over the top. Serve warm, at room temperature, or chilled, as preferred.