Preheat the oven to 350ºF. In a small bowl, mix granulated sugar and cinnamon and set aside.
½ c Granulated Sugar, 2 Tbsp Cinnamon
In a large bowl or the bowl of a stand mixer, beat butter and sugar until the mixture is light and fluffy. It should take approx. 4 minutes. Next, beat in the egg and the vanilla.
1 c Butter, ½ c Brown Sugar, ½ c Granulated Sugar, 1 Egg, 1 tsp Vanilla
Mix in dry ingredients.
¼ tsp Salt, 2 c Flour, 1 tsp Baking Soda, 1 tsp Cream of Tartar
Shape the dough into 1" balls and roll through the cinnamon sugar mixture. Place on baking sheets lined with parchment.
Bake for 9-12 minutes. The lighter in color the chewier the cookie.
While the cookies are cooling make the icing. Mix powdered sugar, vanilla and milk. Add milk until you get the desired consistency.
1 c Powdered Sugar, 1 tsp Vanilla, 1 - 2 Tbsp Milk
Drizzle icing over cookies.