Chocolate Chunk Snowballs

2 cp butter
1 cp icing sugar
3 1/2 cp flour
1/2 cp cornstarch
6 squares bittersweet chocolate
icing sugar

Beat butter and sugar til fluffy. Stir in flour and cornstarch, then chocolate. Roll into balls and place on cookie sheet. Bake @ 350 for 20 minutes. Dust with icing sugar.