Ingredients
3cupsall-purpose flour,spooned and leveled
2tspcream of tartar
1tspbaking soda
1½tspground cinnamon
½tspsalt
1cupunsalted butter,(2 sticks), softened to room temperature
1⅓cupsgranulated sugar
1large egg,plus 1 egg yolk, room temperature
2tsppure vanilla extract
⅓cupgranulated sugar
1tspground cinnamon
Preparation
Preheat the oven to 375 degrees F. Line two large cookie sheets with parchment paper or silicone baking mats. Set aside.
Combine the granulated sugar and cinnamon together in a small bowl. Set aside.
Whisk together the flour, cream of tartar, baking soda, cinnamon, and salt together in a medium bowl.
In a large bowl using a hand mixer or stand mixer fitted with a paddle attachment, beat the butter and granulated sugar together on high speed until smooth and creamy for about 2 minutes.
Add the egg, egg yolk, and vanilla extract. Beat on medium-high speed until combined. Scrape down the sides and up the bottom of the bowl with a rubber spatula as needed.
With the mixer running on low speed, slowly add the dry ingredients to the wet ingredients in 3 different parts. The dough will be thick.
Roll cookie dough into balls, about 1½ tablespoons of cookie dough each. Roll the dough balls in cinnamon-sugar topping.
Sprinkle extra cinnamon-sugar on top, if desired. Arrange the cookies 3 inches apart on the baking sheets.
Bake cookies for 10 minutes. The cookies will be very puffy and soft. When they are still very warm, lightly press down on them with the back of a spoon or fork to help flatten them out.
Allow cookies to cool on the baking sheet for 10 minutes and transfer to a wire rack to cool completely.
Serve and enjoy!
