This is one of my FAVOURITE cookies.
(Apparently darling doesn't think too poorly of them either as he ate all of them in 2 days.)
Ingredients:
Cookie-
2 1/2 cups all-purpose flour
1 tsp baking soda
1/2 tsp cream of tartar
1 cup unsalted butter, softened
1 1/4 cups granulated sugar
1 egg
1 tsp vanilla extract
Cinnamon Sugar-
1/4 cup granulate sugar
2 tsp ground cinnamon
Directions:
In a bowl, whisk together flour, baking soda and cream of tartar until well combined. Set aside.
In a large bowl, using an electric mixer on medium speed, cream butter and granulated sugar until light and fluffy, about 3 minutes. Add egg and beat well. Beat in vanilla. Scrape down sides of bowl. On low speed or using a wooden spoon, gradually add flour mixture, beating just until blended. Vover dough with plastic wrap and chill for at least 1 hour.
Preheat oven to 350F.
In a shallow dish, using a fork or wire whisk , combine granulated sugar and cinnamon until well blended.
Lightly grease hands with nonstick cooking spray. Roll pieces of dough into 1-inch (2.5 cm) balls.
Roll balls in cinnamon sugar.

Place about 2 inches (5 cm) apart on prepared (parchment paper-lined) cookie sheets.
Bake one sheet at a time in preheated oven for 10 to 12 minutes or until edges start to turn lightly golden.
Immediately slide parchment paper onto wire cooling rack. Cool cookies for 5 minutes, then transfer from parchment paper to cooling rack and cool completely.
Yum!