In a medium size bowl, add the flour, cream of tartar, baking soda, and salt. Whisk together and set aside.
In a large mixing bowl, add the butter, sugar, and eggs. Beat until light and creamy. Set the mixer on low speed and slowly spoon in the dry ingredients. Mix until dough forms.
Using a large sturdy spoon, stir the expresso chips into the cookie dough.
Roll 3 teaspoons of dough into a ball for each cookie.