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With an electric mixer, beat butter, egg and vanilla until smooth.
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In separate bowl, whisk together flour, baking powder and salt.
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Gradually add flour mixture to butter mixture, beating until blended.
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Stir in dates, coconut and walnuts.
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Form dough into two 1-1/2-inch rolls; wrap in wax paper or foil.
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Chill in freezer until firm enough to slice easily (about 2 hours) or for as long as 1 month.
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When ready to make, preheat oven to 350 degrees Fahrenheit.
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Lightly grease several cookie sheets.
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With sharp knife, cut rolls into 3/8-inch slices.
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Place slices on prepared cookie sheets.
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Bake about 12 minutes or until golden.
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Cool on wire rack.