In a large mixing bowl, beat butter with an electric mixer on medium-high for 30 seconds. Add white sugar, baking soda, cream of tartar, and salt. Beat until combined, scraping sides of bowl mid-way.
Add in eggs and vanilla; beat til smooth.
Add in flour slowly and mix until combined.
For best results, cover dough and chill for about an hour in refrigerator.
Preheat oven to 375*.
In a small bowl, combine 1/4 cup of sugar and cinnamon.
Shape dough into 1 1/4 inch balls. Roll balls in cinnamon-sugar mixture to coat.
Place balls on ungreased cookie sheet about two inches apart
Bake at 375* for 10-12 minutes or until bottoms are lightly brown. Remove from oven and let stand for 1 minute. Then transfer cookies to cooling rack to cool. ENJOY!