Double Sugar Cookies

Preheat oven to 350°F (175°C).

In a small bowl, sift together flour, cream of tartar, baking soda and salt. Set aside.

Cream butter, shortening and 1 cup sugar in a large bowl until light and fluffy.

Add powdered sugar, eggs and vanilla. Continue to beat until smooth.

Gradually add dry mixture to bowl, stirring until mixed.

Roll dough into 1-inch balls. Place 2-inches apart on cookie sheet and press with a glass bottom dipped in remaining 1/4 cup sugar.

Bake for 8 to 10 minutes or until light golden brown. Transfer to a wire rack to cool.