Preheat oven to 375 degrees F.
Beat butter and sugar.
Once creamy, add eggs and vanilla.
Add flour, salt, baking soda and cream of tartar.
Mix well.
In a bowl, mix the sugar and cinnamon.
Form 2 Tablespoons of dough into a ball.
Roll each ball in the cinnamon/sugar mix and place on parchment lined cookie sheets.
Bake for 10-12 minutes.
Cool!