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Preheat oven to 275°F (135°C). Butter a 15 x 10 jelly-roll pan.
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In a large bowl, cream butter and sugar until light and fluffy.
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Add egg yolk and vanilla; mix well.
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In a medium-size bowl, mix flour and cinnamon.
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Sfir flour mixture into creamed mixture, using hands to mix stiff dough, if necessary.
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Spread evenly in buttered jelly-roll pan.
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In a small bowl, beat egg white just until well mixed; spread over dough.
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Sprinkle pecans evenly over top, then sprinkie lightly with sugar.
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Bake in preheated oven about 1 hour or until set. Cut in 2 x 1" bars or diamond shapes while still very warm.
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Remove cookies from baking sheet to wire racks and cool.
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Cookies become crisp as they cool.