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Sift together flour, baking powder and baking soda, salt and nutmeg until thoroughly blended.
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Add sugar; spoon mixture into a one-quart wide-mouth jar.
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Pack firmly.
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Secure lid and attach these instructions:.
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Blend one large egg, 1 cup butter, and add 1/2 cup sour cream and 1 tsp vanilla.
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Stir in dry ingredients from jar and chill dough overnight.
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Drop cookies by spoonfuls on ungreased cookie sheet.
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Bake at 375° for 10 minutes or light golden brown.