Preheat your oven to 350°F (175°C). Line baking sheets with parchment paper, if desired.
In a mixing bowl, whisk together the flour, baking soda, cream of tartar, and salt. Set it aside.
In a separate large bowl, use an electric mixer or whisk to cream together the softened butter and sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
Gradually add the dry flour mixture to the butter mixture, mixing until just combined.
In a small bowl, mix the 3 tablespoons of sugar with the ground cinnamon to create the rolling mixture.
Using a cookie scoop or spoon, form small balls of dough and roll them in the cinnamon-sugar mixture until coated.
Place the dough balls on the prepared baking sheet about 2 inches apart.
Bake in the preheated oven for 8-10 minutes, or until the edges are lightly golden.
Remove from the oven and let the cookies cool on the baking sheet for a few minutes before transferring them to a cooling rack.