Heat oven to 400°F. Spray or grease 15x10-inch or larger dark or nonstick cookie sheet. Unroll dough on cookie sheet; starting at center, press dough into 15x10-inch rectangle.
Arrange provolone cheese slices on dough. In medium bowl, mix potato, olive oil and ranch dressing mix. Spoon evenly over cheese. Sprinkle with bacon and Cheddar cheese.
Bake 13 to 16 minutes or until crust is golden brown and cheese is melted. Sprinkle with onions. Serve with sour cream.