Perfect Sugar Cookies
["1 c. butter (soft)", "1 c. oil", "1 c. sugar", "1 c. powdered 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 powdered sugar together; add vanilla, baking soda, cream of tartar, eggs and salt.", "Mix well. Add flour, 1 cup at a time.", "Chill for 4 hours.", "Shape into balls, roll in sugar, then flatten.", "Bake at 350\u00b0 for 10 to 13 minutes or until light brown on bottom."]
["butter", "oil", "sugar", "powdered sugar", "vanilla", "baking soda", "cream of tartar", "eggs", "salt", "flour"]