Mix crust ingredients together until smooth. Roll ½ of the dough to fit a 10x15 pan. Fill with sliced apples. Cook cider, cornstarch, sugar until thick. Pour over the sliced apples. Sprinkle with cinnamon and dot with butter. Roll the remaining ½ of the dough and put on the top of the apples. Cut slits in the top crust. Bake at 350 degrees for 50 - 60 minutes. Enjoy!