In a large bowl cream together the butter and 1 cup of sugar. Add egg and vanilla and beat until blended.
In a separate bowl, sift together the flour, salt, cream of tartar, baking soda, and cinnamon. Add to the wet ingredients and mix well until a nice dough forms.
Mix 1/4 cup sugar and 1 tablespoon cinnamon together in a shallow dish (like a pie plate) and set aside.
Divide dough and roll into balls about 1.5-2 tablespoons in size. (Using a medium cookie scoop is very helpful for this). Roll into a ball and then roll in the cinnamon sugar mixture to coat. Place on an ungreased cookie sheet about 2 inches apart.
Bake for 10-12 minutes. Cool on cookie sheets for a few minutes, then transfer to a cooling rack to cook completely.
Store cooled cookies in a tightly sealed container for up to one week.
Notes
These cookies freeze beautifully. Let cool completely on a wire rack before storing in a bag or airtight container.Yes, this recipe has been updated slightly to a more traditional one. Instead of baking powder, it now uses baking soda and that signature ingredient, cream of tartar. I know that many of you loved the cookies as they were, and you can still make them that way. Simply omit the cream of tartar and use 1/2 teaspoon baking powder in place of the soda.