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Heat oven to 400°F Grease a baking sheet.
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In a large bowl, combine flour, 2 tbls sugar, baking powder, and 1 tsp cinnamon; mix well.
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With pastry blender, cut in butter until mixture resembles coarse crumbs.
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Stir in apples and walnuts.
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In a small bowl, combine milk and egg yolk, blend well.
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Add milk/egg mixture to the flour mixture and stir just until dry ingredients are moistened.
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On a lightly floured surface, gently knead dough several times.
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With floured rolling pin, roll dough to 1/2 inch thickness.
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Cut out scones with a 3-inch round cookie cutter.
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Place 2 inches apart on prepared baking sheet.
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In another small bowl, beat egg white until foamy.
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Brush egg whites over tops of scones.
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Mix together the cinnamon and sugar for the topping and then sprinkle this over the scones.
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Bake for 20-22 minutes or until firm to the touch.
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Immediately remove from the baking sheet and serve warm.