Preheat your oven to 350°F (175°C).

Line a baking sheet with parchment paper.

In a medium bowl, whisk together the flour, baking soda, cream of tartar, and salt.

In a large bowl, beat the softened butter and 1 1/2 cups of granulated sugar until light and fluffy.

Mix in the eggs one at a time, then add the vanilla extract.

Gradually add the dry mixture to the wet ingredients, mixing until just combined.

In a small bowl, combine 1/4 cup sugar and cinnamon.

Scoop tablespoon-sized portions of dough, roll into balls, and then roll in the cinnamon-sugar mixture.

Place the coated dough balls on the prepared baking sheet, spacing them about 2 inches apart.

Bake for 8-10 minutes, or until edges are lightly golden.