1Heat oven to 350°F. Beat egg yolk in small bowl. Add 1/2 cup milk; mix well. Set aside.
2Combine flour and salt in medium bowl; cut in butter with pastry blender or fork until mixture resembles coarse crumbs. Stir in egg yolk mixture with fork until dough forms a ball. Divide dough in half.
3Roll out half of dough on lightly floured surface into 15xlO-inch rectangle; place onto bottom of ungreased 15x10x1 inch jelly-roll pan. Sprinkle with corn flakes; top with apples.
4Combine 1 cup sugar, 1 1/2 teaspoons cinnamon and nutmeg in small bowl. Sprinkle over apples. Roll
remaining half of dough into 15 1/2x10 1/2-inch rectangle; place over apples.
5Beat egg white with fork until foamy; brush over top crust. Combine remaining cinnamon and 2 tablespoons
sugar in small bowl; sprinkle over crust. Bake for 45 to 60 minutes or until lightly browned.
6Combine powdered sugar, vanilla and enough milk for desired glazing consistency in small bowl. Drizzle over warm bars.
If pastry dough does not form a ball easily, add up to 1 tablespoon additional milk, 1 teaspoon at a time.