A friend of mine's elderly aunt gave me this recipe. It dates bake from the 50's. These cookies are REALLY REALLY good. I like to roll them in lots of cinnamon and sugar before I bake them, but they are very good without this addition.
In a large bowl cream together the powdered sugar, white sugar and butter. In a separate bowl beat the eggs and then stir in the vanilla, cooking oil, cream of tartar, baking soda and salt. Add in the flour and mix the two mixtures together. Form into small balls and roll in plain sugar or in cinnamon and sugar. Place on a cookie sheet and flatten with the bottom of a glass. Bake at 375 degrees F for 9 to 10 minutes.