1/2 c. butter
1/2 c. shortening
1 c. sugar
2 tbsp. white vinegar
1 egg
2 1/2 c. flour
1/2 tsp. salt
1/2 tsp. baking soda
1 tsp. vanilla

Chill. Roll in balls and flatten with a fork dipped in flour. Sprinkle with sugar after baking. Bake at 350 to 375 degrees for 12 minutes.