Preheat oven to 375F. Separate dough into four rectangles. Press onto bottom and up sides of 15x10x1-inch baking pan to form crust, firmly pressing seams and perforations in dough together to seal.
Bake 11 to 13 min. or until golden brown; cool.
Mix cream cheese, dressing, dill and onion salt until well blended.
Spread onto crust; top with the remaining ingredients.