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Whisk the eggs, ¾ cup (6 oz/170 g) granulated sugar, brown sugar, vanilla extract, and salt into the browned butter.
In a medium bowl, whisk together the flour, cream of tartar and baking soda, then fold into the wet ingredients until just combined.
In a small bowl, combine the remaining ¼ cup (2 oz/56 g) granulated sugar with the cinnamon.
Roll 2-tablespoon portions of dough (about 1 ½ oz/45 g) into balls, then roll each ball in the cinnamon sugar until generously coated.
Preheat the oven to 325°F (160°C) fan assist. Line 2 baking sheets with parchment paper.