Step 1

Preheat oven to 350 degrees. Cover a baking sheet with parchment paper or a silicone mat.

Step 2

In a medium bowl, whisk together the flour, cream of tartar, baking soda, and salt. Set the mixture aside.

Step 3

In a bowl of a stand mixer with the paddle attachment or a hand mixer, blend the butter and sugars until light and creamy.  Turn the mixer to low and stir in the eggs one at a time, mixing just until incorporated.  Stir in the vanilla extract mixing until blended.

Step 4

Add the dry ingredients to the butter mixture in several intervals stirring just until incorporated.

Step 5

In a small bowl, mix 3 tablespoons of granulated sugar with the cinnamon. Use a cookie scoop and your hands to shape the cookie dough into 1 1/2-inch balls. Roll the cookie dough balls in cinnamon sugar.  Place on the prepared baking sheet about 2 1/2 inches apart.

Step 6

Bake for 8-10 minutes or until lightly browned. Cool for 5 minutes on the baking sheet before moving them to wire racks to finish cooling.