Preheat your oven to 375 degrees and line two baking sheets with either parchment paper or silicone baking mats. Set aside. Set aside.
In a small bowl, make the cinnamon/sugar coating by combining the 1/4 cup sugar and teaspoon of cinnamon and mixing well.
¼ cup granulated white sugar, 1 teaspoon cinnamon
In a large bowl, add the softened butter and cream for about 1 minute on medium speed, using either a hand mixer or your stand mixer, until it is smooth.
1 cup unsalted butter
Add the sugar and mix until fluffy.
1 ⅓ cup granulated white sugar
Add in the egg and vanilla and mix until fully incorporated.
1 large egg, 2 teaspoons vanilla extract
In a separate medium bowl, add the flour, cream of tartar, baking soda, cinnamon, and salt. Whisk it together.
3 cups all purpose flour, 2 teaspoons cream of tartar, 1 teaspoon baking soda, 2 ½ teaspoons cinnamon, ½ teaspoon salt
Turn the mixer on low and slowly add the flour mixture to the butter mixture. The dough will be thick.
Use a cookie scoop to portion out dough balls and roll in the cinnamon/sugar coating mixture. Line 12 per cookie sheet and bake for 10 minutes.
The cookies will be puffy - I pressed down on them as they came out of the oven with the back of a wooden spoon to help flatten them out a bit.
Let them cool on the baking sheet for about 10 minutes before transferring to a wire rack to cool completely.