01 - Place potatoes in a large pot, cover with cold water, and add 1 tablespoon salt. Bring to a boil, then reduce heat and simmer for 10 to 12 minutes until fork-tender. Drain potatoes and allow to cool slightly.
02 - While the potatoes cook, fry chopped beef bacon in a large skillet over medium heat until crispy. Transfer 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 bowl with the dressing and gently fold to fully coat the potatoes.
05 - Incorporate celery, green onions (reserving some for garnish), cheddar cheese, chopped parsley, and most of the cooked beef bacon. Gently mix until evenly combined.
06 - Season mixture with additional salt and black pepper to taste.
07 - Transfer potato salad to a serving platter or large bowl. Garnish with reserved green onions, beef bacon, and extra parsley as desired. Offer warm, at room temperature, or chilled.