Heat oven to 375, Combine butter, powered sugar and 1/2 cup sugar in large bowl. Beat at medium speed, scraping bowl often, until creamy. Add egg and vanilla; continue beating until well mixed. Reduce speed to low; add flour, cream of tartar and baking soda. Beat until dough forms a ball. Shape dough into 1 inch balls. Place 2 inches apart onto ungreased cookie sheets. Flatten to about 1/2 inch with bottom of glass dipped in sugar; sprinkle with colored sugars,if desired. Bake for 7 to 9 mins.or until edges are lightly browned.Let stand 1 min. and remove from cookie sheets.
These cookies are REALLY good, our family loves them and there very easy to make, Enjoy:)