1/2 c. butter
1/2 c. butter
1/2 c. sugar
1/2 c. powdered sugar
1 tsp. pure vanilla
1 egg
2 1/2 c. sifted flour
1/2 tsp. salt
1/2 tsp. cream of tartar

In large bowl, cream well the first 6 ingredients, set aside. In medium bowl, sift together flour, salt and cream of tartar. Add this to butter mixture, mix well. Chill for about 1/2 hour.

Roll in balls about walnut size. Place balls onto ungreased cookie sheet, flatten balls with a flat bottomed glass that has first been dipped in sugar. Bake at 375 degrees for 10 to 12 minutes. Place on rack or newspaper to cool.