Unroll crescent dough into one long rectangle. Press onto the bottom and 1/2 in. up the sides of a greased 13-in. x 9-in. x 2-in. baking pan. Seal seams and perforations. Sprinkle with bacon, potatoes and cheddar cheese.
In a bowl, beat eggs and milk. Pour over cheddar cheese. Sprinkle with Parmesan cheese. Bake, uncovered, at 375 degrees F for 25-30 minutes or until eggs are completely set.