PREHEAT oven to 375°F. Separate dough into 4 rectangles. Press onto bottom and up side of 15x10x1-inch baking pan to form crust.
BAKE 11 to 13 minutes or until golden brown; cool.
MIX cream cheese, dressing, dill and onion salt until well blended. Spread over crust; top with remaining ingredients. Refrigerate. Cut into squares.