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Preheat oven to 350 degrees.
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Lightly grease two baking sheets.
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Cream sugar and butter together until light.
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Beat in yolks and vanilla.
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Sift together the measured sifted flour, baking soda and cream of tartar then fold into the butter sugar mixture.
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Form dough into walnut size balls.
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Place 2" apart on the cookie sheets.
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Do not flatten.
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Bake for about 11 minutes until the tops are cracked and just turning color.
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Cool on cookie sheet 2 minutes.