Preheat your oven to 350°F (175°C).

In a medium-sized bowl, whisk together the all-purpose flour, baking soda, cream of tartar, and ground cinnamon.

In a separate bowl, beat softened butter with granulated sugar and brown sugar until fluffy.

Add the eggs one at a time to the butter-sugar mixture, mixing well after each addition. Add vanilla extract and mix until incorporated.

Gradually combine the dry mixture with the wet mixture, stirring gently until just mixed.

Scoop and form dough balls about 1-2 inches wide and roll in a mixture of cinnamon and sugar to coat.

Line a baking sheet with parchment paper and arrange the dough balls spaced apart.

Bake in the preheated oven for 8-10 minutes until the edges are golden and the centers are slightly underbaked.

Remove from the oven and let cool on the baking sheet for a few minutes before transferring to wire racks to cool completely.