PREHEAT oven to 400°.
SIFT SWANS DOWN Cake Flour, lightly spoon needed quantity into measurement cup.
IN a large bowl, cream butter and sugar. Add eggs one at a time then add vanilla.
IN a separate bowl, sift together SWANS DOWN, cream of tartar, baking soda and salt, blend well. Slowly add flour mixture to butter mixture and blend well.
COMBINE 1/3 cup sugar and 2 teaspoons cinnamon in a small saucer.
FORM dough into 1” balls and roll into cinnamon sugar. Place on buttered cookie sheet about 2” apart.
BAKE at 400° for 8-10 minutes or until golden brown. Remove from cookie sheet to wire rack immediately to cool. Store covered at room temperature.