Preheat your oven to 350°F (175°C).

In a large bowl, cream together the softened butter and sugar until light and fluffy.

Beat in the eggs, one at a time, then stir in the vanilla extract.

In another bowl, combine the flour, cream of tartar, baking soda, and salt.

Gradually mix the dry ingredients into the wet mixture until combined.

Roll the dough into balls and then roll each ball in the cinnamon-sugar mixture.

Place them on a baking sheet lined with parchment paper, leaving space between each cookie.

Bake for about 8 to 10 minutes, or until the edges are lightly golden.

Let the cookies cool slightly before transferring them to a wire rack.