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Preheat oven to 350 degrees; lightly grease baking sheets.
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Place flour, cinnamon, and salt in work bowl of food processor; pulse five or six times until blended.
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Remove to a small bowl.
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Process butter and brown sugar about 30 seconds, scraping down sides once or twice, until light and fluffy.
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Add egg yolk and process about 10 seconds to blend.
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Add flour mixture and pulse six to eight times, just until blended.
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Wrap dough in plastic wrap and chill at least one hour or overnight (Dough may also be frozen up to a month).
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Roll out dough, half at a time, to 1/8-inch thick.
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Cut with cookie cutter and place cookies two inches apart on baking sheets.
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Sprinkle with sugar.
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Bake seven to eight minutes until firm and just beginning to darken at edges.
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Cool on wire racks.