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In a large bowl mix with a fork the flour, baking powder, and salt.
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With a pastry blender cut in shortening and mashed potatoes until mixture resembles coarse crumbs.
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Stir in milk until mixture is moistened.
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Turn dough out on floured board and knead 6 to 8 times.
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Roll out to about 1/2 inch thick and cut with biscuit cutter.
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Place on baking sheet 1 1/2 inches apart.
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Bake at 450 degrees for 12 to 15 minutes or until golden brown.
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Serve warm with fresh butter or honey.