Preheat oven to 350°F. For crust, add enough milk to egg yolk to measure 2/3 cup; set aside. Combine flour and salt in medium bowl. Cut in butter until crumbly using pastry blender or two knives. With fork, stir in milk mixture until dough forms ball; divide into 2 halves. Roll out half to 15X10-inch rectangle on lightly floured surface. Place on bottom of ungreased 15X10X1-inch jelly-roll pan.

For filling, sprinkle graham cracker crumbs over top of dough; layer apple slices over crumbs. Combine 1 cup granulated sugar, 1-1/2 teaspoons cinnamon and nutmeg in small bowl; sprinkle over apples.

Roll out remaining dough into 15X10-1/2-inch rectangle; place over apples. With fork, beat egg white in small bowl until foamy; brush over top crust. Stir together remaining 2 tablespoons granulated sugar and remaining 1 teaspoon cinnamon in another small bowl; sprinkle over crust. Bake 45 to 60 minutes or until lightly browned.

For drizzle, stir together all ingredients in small bowl. Drizzle over top; cut into bars.