Begin by browning your butter in a medium saucepan over medium heat until golden brown and nutty.
In a large mixing bowl, whisk together the browned butter, white sugar, and brown sugar until smooth. Add eggs and vanilla extract, mixing until fully incorporated.
In another bowl, whisk together the flour, cream of tartar, baking soda, and salt. Gradually add to the wet mixture, stirring until just combined.
Cover the dough with plastic wrap and refrigerate for at least 30 minutes.
Mix together the white sugar and ground cinnamon for the coating.
Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
Use a cookie scoop to portion out the dough, roll in the cinnamon sugar, and place on the baking sheets.
Bake the cookies for 10-12 minutes, until the edges are lightly golden.
Cool on the baking sheets for 5 minutes before transferring to a cooling rack.
