Cream together in the following order: 1/2 cup of butter, 1/2 cup shortening, 1 cup sugar, 1 tablespoon vanilla, 1 egg.
Next, in a separate bowl, shift together the following: 2 1/2 cups of flour, 1/2 teaspoon baking soda, 3/4 teaspoon of salt.
Add theses sifted dry ingredients to the butter mix in the other bowl and blend together. Now heat your oven to 350°F.
Roll dough into 2cm balls and place on a baking sheet. You will flatten the balls with the bottom of a drinking glass that has been dipped in sugar. (You can wet the bottom of the glass with water to make it sticky.)
Bake for approximately nine minutes.