Snickerdoodles

Directions

1. 1
   Adjust oven rack to the middle position and preheat oven to 400 degrees F. Whisk together the flour, baking soda, cream of tartar and 1/4 teaspoon salt in a medium bowl.
2. 2
   Add the butter, 1 cup of the granulated sugar, brown sugar and egg to the bowl of a stand mixer fitted with a paddle attachment (or a large bowl if using a hand mixer).
3. 3
   Beat on medium speed just to combine, about 30 seconds.
4. 4
   Add the flour mixture in 2 parts and beat on low until just combined.
5. 5
   Let the dough rest at room temperature for 30 minutes.
6. 6
   Whisk together the remaining 1/4 cup granulated sugar and cinnamon in a small bowl.
7. 7
   Form the dough into 1 1/4-inch balls (about 1 tablespoon dough per cookie).
8. 8
   Roll each ball in the cinnamon-sugar and coat well; arrange on two baking sheets, 2 inches apart.
9. 9
   Do not flatten the balls, as they will spread a lot in the oven.
10. 10
    Bake one sheet of cookies at a time until the tops look cracked and the center still feels soft, about 9 minutes.
11. 11
    Let the cookies cool in the pan for 3 minutes; they will continue cooking during this time.
12. 12
    Once they've firmed up a little, transfer them to a rack to continue cooling.
13. 13
    Store the cooled cookies in an airtight container for up to 3 days.