Preheat oven to 350 degrees.
In a stand mixer, blend butter and sugar until creamy, about 4-5 minutes.
Then add eggs and vanilla and mix another 1-2 minutes.
Mix add flour, salt, baking soda and cream of tartar until just combined. don't over mix at this point.
Optional: allow dough to cool in the refrigerator for 20-30 minutes before rolling it into balls.
In a shallow bowl, combine ¼ cup of sugar and 1 ½ Tbsp. of cinnamon. Stir until well combined.
Roll dough into smooth, round balls, about 2-inches in diameter.
Roll the balls into the cinnamon sugar mixture until well coated.
Place the dough balls on parchment lined baking sheets and press down in the middle for a flatter cookie.
Bake at 350º for 8-10 minutes, until edges start to brown. I really like to take them out at the 8-minute mark.
Let the cookies cool before placing them in an air tight container.