Preheat your oven to 350°F (175°C) and line three baking sheets with parchment paper.
In the bowl of a stand mixer fitted with the paddle attachment, cream the softened butter and granulated sugar on medium speed until light and fluffy, about 2-3 minutes.
Add the eggs, one at a time, mixing well after each addition.
Mix in the maple syrup and vanilla extract until fully incorporated.
In a medium bowl, whisk together the flour, cream of tartar, baking soda, and kosher salt.
With the mixer on low speed, gradually add the dry ingredients to the wet ingredients. Mix until just combined, being careful not to overmix.
In a small, shallow bowl, stir together the granulated sugar and ground cinnamon for the cinnamon-sugar coating.
Using a 1-tablespoon scoop, portion out the dough into balls. Roll each ball in the cinnamon-sugar mixture until evenly coated.
Place the coated dough balls onto the prepared baking sheets, spacing them about 1 inch apart.
Bake in the preheated oven for 6 to 8 minutes, or until the edges are set and slightly golden. The centers should appear soft for a chewy texture.
Remove the baking sheets from the oven and let the cookies cool for 2-3 minutes before transferring them to a cooling rack to cool completely.