Preheat oven to 400°F degrees. Coat a pie plate or oven-safe skillet with nonstick spray.
In a large bowl, combine cream cheese, corned beef, Swiss cheese, sauerkraut, sour cream, and dressing and mix well. Spread into prepared pie plate and bake until hot and bubbly, about 15 to 20 minutes. Serve with crackers or chips.