01 - Place cubed 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 potatoes are fork-tender. Drain thoroughly and allow to cool slightly.
02 - In a large skillet over medium heat, crisp chopped beef bacon, stirring occasionally. Transfer to paper towel-lined plate 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 dressing. Gently fold to coat the potatoes evenly without breaking them apart.
05 - Add celery, most of the green onions, shredded cheddar, chopped parsley, and most of the cooked beef bacon to the bowl. Gently mix until all components are uniformly distributed.
06 - Taste the mixture and season with additional salt and pepper as desired.
07 - Transfer salad to a serving platter or bowl. Top with reserved beef bacon, green onions, and additional parsley for an attractive finish.
08 - Serve warm, at room temperature, or chilled as preferred.