01 - Place the cubed potatoes in a large pot. Fill with cold water to cover, add 1 tablespoon salt, and bring to a boil. Reduce heat and simmer for 10 to 12 minutes until potatoes are fork-tender. Drain potatoes and allow to cool slightly.
02 - While the potatoes are cooking, fry the chopped beef bacon in a large skillet over medium heat until crispy. Transfer the cooked bacon to a paper towel-lined plate to drain excess fat.
03 - In a large mixing bowl, whisk together the sour cream, mayonnaise, Dijon mustard, and black pepper until the mixture is smooth and well blended.
04 - Add the still-warm, drained potatoes to the mixing bowl with the dressing. Gently fold the potatoes into the dressing until coated evenly.
05 - Add the diced celery, sliced green onions, shredded sharp cheddar cheese, chopped parsley, and most of the cooked beef bacon to the bowl, reserving a portion of bacon and green onions for garnish. Gently mix until all ingredients are evenly distributed.
06 - Taste and season with additional salt and pepper as needed. Adjust for flavor preference.
07 - Transfer the prepared salad to a serving platter or large bowl. Top with the reserved beef bacon, green onions, and extra parsley. Serve warm, at room temperature, or chilled as desired.