Stir flour, cream of tartar, baking soda and salt
Cream butter and sugar then add eggs and vanilla
Combine wet and dry ingredients, cover and refrigerate for 20-30 minutes. Roll dough into small balls and drop in cinnamon/sugar mix coating well.
Preheat oven to 350 degrees and bake for 8-9 minutes. I used parchment paper but it’s not necessary if your cookie sheets are “broken in”.