Preheat your oven to 350°F (175°C).

In a bowl, whisk together the flour, baking soda, cream of tartar, and ground cinnamon until well combined.

In a separate bowl, beat the softened butter with granulated sugar and brown sugar until it’s light and fluffy.

Add the eggs one at a time and mix in the vanilla extract until fully incorporated.

Gradually combine the wet and dry mixtures while stirring gently until just mixed.

Scoop out dough balls (about 1-2 inches wide), roll them in a cinnamon-sugar mixture, and place them on a parchment-lined baking sheet.

Bake for 8-10 minutes until the edges are golden but the centers are slightly underbaked.

Let them cool before transferring to wire racks to finish cooling.