HEAT oven to 350ºF.
MICROWAVE semi-sweet chocolate and butter in large microwaveable bowl on HIGH 1 min. or until butter is melted. Stir until chocolate is completely melted. Beat eggs and sugar in large bowl with mixer on high speed 2 min. Add chocolate mixture and vanilla; beat on low speed until well blended. Add flour, baking powder and salt; mix well. Stir in nuts and cranberries.
DROP level measuring tablespoonfuls of dough, 2 inches apart, onto baking sheets sprayed with cooking spray.
BAKE 8 to 10 min. or until cookies feel set to the touch. Cool 1 min. on baking sheets; remove to wire racks. Cool completely.
MICROWAVE white chocolate as directed on package. Spoon into resealable plastic bag. Cut very small piece off one bottom corner of bag; use to drizzle chocolate over cookies. Let stand until chocolate is firm.