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- In a large bowl, mix oil, butter, sugar, eggs, and vanilla until creamy.
- Mix together cream of tarter, baking soda, flour, and salt. Add these dry ingredients to the creamed mixture. Chill dough for 15 to 20 minutes.
- Roll dough into balls, and place on greased cookie sheets. Press balls with a glass dipped in sugar to flatten.
- Bake at 350 degrees F (175 degrees C) for 8 to 10 min.