Heat oven to 325°F. Combine all ingredients except powdered sugar in large mixer bowl. Beat at low speed, scraping bowl occasionally, until well mixed (2 to 3 minutes). Shape rounded teaspoonfuls of dough into 1-inch balls. Place 1 inch apart onto ungreased cookie sheets. Bake for 18 to 25 minutes or until very lightly browned. Cool 5 minutes; roll in powdered sugar while still warm and again when cool.