Fill large pot with cubed potatoes and top with water until all potatoes are covered. Bring to a boil, add 2 tbsp of salt to flavour, cook until potatoes are soft when poked with a fork. Drain potatoes and place into a large mixing bowl, add cheese and stir. Mash with potato masher until there are only small lumps. Add carrots, celery, peppers, four cheese salad dressing and miracle whip; mix well. Add more four cheese dressing if not moist enough. Season with pepper.
Can be served warm or cold.
Serves 8 people.