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Preheat oven to 275°F In large bowl with an electric mixer, beat butter and sugar until creamy.
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Separate egg, then beat yolk into butter mixture; cover and reserve the egg white.
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In another bowl, stir together flour and cinnamon; add to butter mixture.
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With your hands, spread dough evenly over bottom of a greased 10 by 15-inch rimmed baking pan.
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Beat egg white lightly, then brush over dough to cover evenly.
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Sprinkle pecans over top; press in lightly.
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Bake for 1 hour or until firm when lightly touched. While still hot, cut into 1/2-inch squares. Let cool in pan on a rack. Store in an airtight container.