Preheat oven to 350F.
In a large bowl with electric mixer
at med. speed, beat brown sugar and butter,
scraping down side of bowl often,
until light and fluffy, 1-2 min.
Add chocolate and vanilla.
Continue beating and scraping 2 min. longer.
Reduce speed to low and add flour and nuts.
Beat until well mixed, 1-2 min.
Shape dough into 1" balls.
Place 2" apart on ungreased baking sheets.
Bake just until set, 8-10 min.
Cool 5 min. on cookie sheets.
Remove to wire racks and cool 5 min. longer.
While still warm, roll in conf. sugar.
Cool completely then roll in conf. sugar again.
Makes 60 cookies.