01 -
Heat oven to 400°F and line cookie sheet with parchment or silicone mat.
02 -
Combine flour, cream of tartar, baking soda, and salt.
03 -
Beat butter and sugar until light and fluffy, 2-3 minutes.
04 -
Mix in eggs one at a time, then vanilla extract.
05 -
Mix in dry ingredients until combined.
06 -
Roll tablespoon-sized balls in cinnamon sugar mixture.
07 -
Bake 6-8 minutes, let rest 2-3 minutes before moving to rack.