Beat margarine with an electric mixed on med-high for 30 seconds. Add half the flour, 1 cup of sugar, egg, vanilla, baking soda and cream of tartar. Beat until thoroughly combined. Add remaining flour and mix. Cover and chill 1 hour.

Shape dough into 1" ball. Combine the 2 Tblspn sugar and cinnamon. Roll balls in cinnamon/sugar. Place on ungreased cookie sheet, 2 inches apart. Bake at 375 degrees for 10-11 minutes (edges should be golden). Cool cookies on a wired rack.