Make a crust using the shortening, flour, sugar, s alt and water. .  Roll out half of the dough and put in the bottom of a jelly roll pan.  Spread 3 large handfuls of Cornflakes on top of the dough.   Mix sliced apples, 1 1/2 C of sugar and cinnamon and spread over the top of the Cornflakes.  Roll out the other half of the dough and place on top of the apples.  Beat the egg whites until foamy and brush on top of the top crust.  Bake for 45 mins at 350 degrees.