Ingredients

• 1 1/2 sticks (3/4 cup) salted butter, softened, plus additional for greasing
• 1 cup plus 2 tablespoons sugar
• 1 whole large egg, lightly beaten
• 1/2 teaspoon vanilla
• 2 cups all-purpose flour
• 1/2 teaspoon cinnamon
• 1 large egg white, lightly beaten

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Instructions

1. Stir together butter and 1 cup sugar vigorously with a wooden spoon in a large bowl until combined well, then stir in whole egg and vanilla until smooth. Add flour and stir until just incorporated.
2. Transfer dough to a 24-inch-long sheet of wax paper. Using sheet as an aid, roll dough into a 12-inch-long log (2 inches wide). Chill, wrapped in wax paper, until firm, at least 4 hours.
3. Put oven racks in upper and lower thirds of oven and preheat oven to 375°F. Lightly grease 2 large baking sheets with additional butter.
4. Stir together cinnamon and remaining 2 tablespoons sugar in a small bowl.
5. Cut chilled log crosswise into 1/8- to 1/4-inch-thick slices, arranging slices about 1 inch apart to fill both baking sheets (chill remainder of log wrapped in wax paper). Lightly brush sliced cookies with some egg white, then sprinkle with some of cinnamon-sugar mixture.
6. Bake cookies, switching position of sheets halfway through baking, until edges are golden, 12 to 15 minutes total. Cool on sheets 3 minutes, then transfer with a metal spatula to racks to cool completely. Repeat with remaining dough, cooling and greasing baking sheets between batches.