Soft and Chewy Snickerdoodle Cookies

0 Preheat oven to 350°F. Line 2 baking sheets with parchment paper.
1 In the bowl of a stand mixer fitted with a paddle attachment, cream the butter and granulated sugar until combined and fluffy. Scrape the bowl well, then add the eggs one at a time and vanilla with the mixer on low speed. Mix until well combined.
2 Scrape the bowl again and add the flour, cornstarch, cream of tartar, baking soda, and salt. Mix until all the ingredients are well incorporated.
3 In a small bowl, combine the sugar and cinnamon for the coating. Portion the dough using a #24 cookie scoop (about 3 Tablespoons). Roll each scoop into a ball, then roll in the cinnamon sugar mixture until completely coated.
4 Place the cookies onto the prepared baking sheets, spacing them at least 2 inches apart.
5 Bake at 350°F for 11-13 minutes or until golden brown around the edges.
6 Sprinkle the cookies with the remaining cinnamon sugar while hot, if desired. Allow to cool for at least 10 minutes and enjoy!