Perfect Sugar Cookies
["1 c. butter, softened", "1 c. oil", "1 c. sugar", "1 c. confectioners sugar", "2 tsp. vanilla", "1 tsp. baking soda", "1 tsp. cream of tartar", "2 eggs", "1/4 tsp. salt", "4 c. flour"]
["Cream butter, oil, sugar and confectioners sugar in large bowl until light.", "Add vanilla, baking soda, cream of tartar, eggs and salt.", "Mix well.", "Add flour, 1 cup at a time, mixing well after each addition.", "Chill for 4 hours or longer.", "Shape into small balls.", "Place on cookie sheet.", "Flatten into bottom of glass dipped in sugar.", "Bake at 350\u00b0 for 10 to 13 minutes or until light brown.", "Remove to wire rack to cool."]
["butter", "oil", "sugar", "confectioners sugar", "vanilla", "baking soda", "cream of tartar", "eggs", "salt", "flour"]