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Preheat oven to 400*.
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Lightly grease baking sheets.
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Cream butter and sugar together.
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Add egg whites, one at a time, mixing well after each.
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Add flour and then vanilla, mixing well.
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If dough seems to soft, add a bit more flour.
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Force through a pastry bag or cookie press fitted with a medium star tip onto baking sheets, making cookies about 3 inches long.
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Bake for 10 minutes or until lightly browned.
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Cool on wire racks completely.
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If desired, make sandwich cookies by spreading with jam or melted chocolate, or be truly decadent by making jam filled sandwich cookies and then dipping in chocolate!