MIX corn syrup and evaporated milk in a microwave-safe 2-quart bowl. Stir until well blended.
MICROWAVE on HIGH (100%), 3 minutes. Stir in chocolate chips until melted. Stir in powdered sugar, vanilla and nuts. Beat 1 to 2 minutes with a wooden spoon until thick and glossy. Spread in 8-inch square pan lined with plastic wrap.
CHILL 2 hours or until firm. Cut into squares.