01 - Place the potatoes in a large pot. Cover with cold water and add 1 tablespoon of salt. Bring to a boil over high heat, then reduce to a simmer. Cook for 10–12 minutes until the potatoes are fork-tender. Drain thoroughly and allow to cool slightly.
02 - While the potatoes cook, sauté chopped beef bacon over medium heat in a large skillet until deeply browned and crisp. Transfer to a paper towel-lined plate to drain excess fat.
03 - In a large mixing bowl, vigorously whisk together sour cream, mayonnaise, Dijon mustard, and black pepper until smooth.
04 - Add the warm, drained potatoes to the prepared dressing. Gently fold to coat each piece without breaking them up.
05 - Add diced celery, sliced green onions (reserving some for garnish), shredded cheddar cheese, chopped parsley, and most of the cooked beef bacon. Gently fold together until all ingredients are evenly distributed.
06 - Taste the salad and season with additional salt and black pepper as needed.
07 - Transfer to a serving bowl or platter. Garnish generously with reserved green onions, remaining bacon, and extra parsley.
08 - Serve the salad warm, at room temperature, or chilled depending on preference.