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Cream butter and cream cheese in large mixer bowl.
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Beat in sugar until smooth.
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Beat in egg and vanilla.
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Stir in flour and baking powder.
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Chill several hours (I would say 3 hours).
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Heat oven to 375 degrees.
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Roll dough into small balls.
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Place on ungreased cookie sheet.
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Flatten with a glass that has been dipped in vanilla sugar (sugar in which you have stored a vanilla bean) or plain sugar.
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Bake 10 to 15 minutes, until the edges are lightly browned.
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Cool on wire racks.