Step 1: Preheat your oven to 350°F (175°C).
Step 2: In a mixing bowl, cream the softened unsalted butter and 1 cup granulated sugar until light and fluffy, about 2-3 minutes.
Step 3: Add the large egg and 1 teaspoon vanilla extract to the creamed mixture. Mix until fully incorporated.
Step 4: In a separate bowl, whisk together the cream of tartar, baking soda, table salt, and all-purpose flour. Gradually add this to the wet ingredients, mixing until just combined.
Step 5: In a small bowl, mix together the 2 tablespoons granulated sugar and 1 teaspoon ground cinnamon for rolling.
Step 6: Scoop and roll the dough into balls, then roll each in the cinnamon-sugar mixture.
Step 7: Place the dough balls on a baking sheet lined with parchment paper, spacing them about 2 inches apart. Bake for 10-12 minutes until lightly golden.
Step 8: Let the cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
