- Preheat the oven to 350°F. Line two baking sheets with parchment paper and set aside. 
- Whisk together the flour, 1 teaspoon cinnamon, baking soda, cream of tartar, and salt. Set aside. 
- In a small bowl, stir together 1 teaspoon of cinnamon and ½ cup granulated sugar and set aside. 
- Using an electric mixer (stand or hand mixer), mix the softened butter together with the granulated and brown sugars until combined. Add in the eggs and vanilla. Mix until combined. 
- Stop the mixer and scrape down the sides and bottom of the bowl. In two additions, add in the half of the flour mixture at a time. Mix on low until incorporated then add in the remaining half. Mix until combined. 
- Stir in the pecans. 
- Use a large cookie scoop to portion the cookie dough into equal sizes (about 3 tablespoons each) and roll into balls. 
- Roll the cookie dough balls in the cinnamon sugar mix and place on the prepared baking sheets, at least two inches apart. Place a whole pecan on tap then gently pat the dough balls down with the palm of your hand. 
- Bake for about 10 minutes. The centers should be puffy and the edges just set and slightly browned around the edges. For a chewier center,rap the bottom of the baking sheet on the oven rack to encourage the cookies to flatten slightly. 
- Allow cookies to cool on the baking sheet for 5 minutes before moving to a wire rack.