Beat butter at medium speed with electric mixer; gradually add sugars, mixing well. Add egg and vanilla extract; beat well.Combine flour, baking soda and cream of tartar; gradually add to creamed mixture, mixing after each addition. Stir in cashews. Drop cookie dough by rounded teaspoonsful onto lightly greased cookie sheets; bake at 350 degrees F for 10 to 12 minutes or until lightly browned. Makes 7 dozen.
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