01 - Place 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 and allow to cool slightly.
02 - While potatoes are cooking, fry chopped beef bacon in a large skillet over medium heat until deeply browned and crispy. Transfer the bacon to a 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 mixture. Gently fold with a spatula to coat the potatoes fully.
05 - Add celery, green onions, cheddar cheese, parsley, and most of the cooked beef bacon, reserving a portion for garnishing. Mix gently until all ingredients are evenly distributed.
06 - Taste and adjust with additional salt and pepper as needed.
07 - Transfer the assembled potato salad to a serving platter or bowl. Garnish with reserved green onions, beef bacon, and a sprinkle of extra parsley.
08 - Serve warm, at room temperature, or chilled as preferred.