Preheat oven to 375º

Mix together flour, baking soda, cream of tartar, salt and baking soda

In a separate bowl, cream together butter and sugar

Add in eggs, vanilla and milk

Slowly add flour mixture to from the dough

In a separate bowl mix sugar and cinnamon for the sugar mixture

Roll dough into balls and then roll each ball into the sugar mixture

Place onto a baking pan lined with parchment paper and use a glass to gently flatten each dough ball

Bake approximately 8 minutes or until cooked through