Heat oven to 375°F. Grease cookie sheet. Lightly spoon flour into measuring cup; level off. In large bowl, combine flour, 2 tablespoons sugar, baking powder and 1 teaspoon cinnamon; mix well. With pastry blender or fork, cut in butter until mixture resembles coarse crumbs. Stir in apples and walnuts.
In small bowl, combine milk and egg yolk; blend well. Add to flour mixture; stir just until dry ingredients are moistened.
On lightly floured surface, gently knead dough several times. With floured rolling pin, roll dough to 1/2-inch thickness. Cut out scones with 3-inch round or holiday-shaped cookie cutter. Place 2 inches apart on greased cookie sheet.
In small bowl, beat egg white until foamy. Brush over tops of scones. In another small bowl, combine 1 tablespoon sugar and 1/2 teaspoon cinnamon; mix well. Sprinkle over scones.
Bake at 375°F. for 10 to 15 minutes or until firm to the touch. Immediately remove from cookie sheet. Serve warm.