Cream together the butter and both the granulated sugar and brown sugar with an electric mixer. Add in the eggs and vanilla extract.
Whisk together the flour, cream of tartar, baking soda, and salt in a medium bowl. In a separate small bowl, whisk together the ground cinnamon and sugar. Set it aside.
Scoop 1-inch balls of the cookie dough and roll in the cinnamon sugar mixture. You can use a cookie scoop or a spoon! So easy!
Place the cinnamon sugar-coated cookie dough onto a parchment paper-lined baking sheet and bake for 8 to 10 minutes.