Preheat the oven to 400°F. Cover two or more baking sheets with parchment paper.

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

In the bowl of an electric mixer, beat together the butter and granulated sugar until fluffy. Add the eggs and mix again.

Add the dry mixture to the creamed butter mixture. Mix together on low speed until a consistent dough forms. Chill the dough for 30 minutes.

Meanwhile, on a small shallow plate, combine the ingredients for the cinnamon-sugar coating.

Use a cookie scoop to portion the dough and then roll it into walnut-sized balls. Roll each dough ball in the cinnamon-sugar mixture.

Place about 2” apart on the prepared cookie sheets. Bake for 8 minutes. Let cool on the pans until firm enough to transfer to wire racks. Cool completely.

Store cookies airtight.