In a mixing bowl, cream butter and confectioners' sugar.

Beat in egg whites and vanilla.

Combine flour, baking powder and baking soda; gradually add to creamed mixture.

Roll into 1 1/2" balls, then roll in sugar.

Place 2 inches apart on greased baking sheets. Flatten with fork.

Bake at 350 degrees for 12-14 minutes or until edges are lightly browned. Remove to wire racks and cool.

Description:
"From Taste of Home"
Yield:
"4 dozen"