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Preheat oven to 400 degrees.
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In a large bowl using an electric mixer, cream butter, sugar, egg and vanilla.
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Add remaining ingredients and beat thoroughly.
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Scrape dough out of bowl and onto a large piece of plastic wrap. Roll dough into a log, about 2 1/2 inches wide. Completely wrap dough in plastic and refrigerate until firm; at least 20 minutes or up to overnight.
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Cut dough into 1/8 inch thick slices and arrange on several large ungreased cookie sheets about 1 to 1 1/2 inches apart.
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Bake until lightly browned around edges, about 8 to 10 minutes.
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Allow cookies to cool on cookie sheet for about 1 minute and then remove to a wire rack to cool completely.
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Yiels 1 cookie per serving.