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1
Sift together the flour, baking soda and salt.
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2
Using an electric mixer, in a large bowl, beat the butter with 1/4 cup of the granulated sugar and the brown sugar at medium speed until combined.
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3
Add the egg and vanilla and beat until pale.
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4
Stir in the dry ingredients just until combined.
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5
Divide the dough into thirds and wrap in plastic wrap.
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6
Shape the dough into 6-inch logs and refrigerate or freeze until firm.
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7
Preheat the oven to 350.
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8
In a small bowl, combine the remaining 1/2 cup of granulated sugar with the cinnamon and spread on a flat plate.
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9
Unwrap the logs and roll them in the cinnamon sugar until thoroughly coated.
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10
Rewrap the logs and refrigerate or freeze until firm.
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11
Slice the cookie dough logs 1/4 inch thick.
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12
Arrange the slices 1 inch apart on 2 large cookie sheets and bake for 18 to 20 minutes, or until golden.
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13
Transfer the cookies to a rack to cool and bake the remaining cookies.
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14
Serve the cookies when they have cooled.