In large microwavable bowl, microwave white chocolate uncovered on High 2 to 3 minutes, stirring every 30 seconds, until melted. Stir in condensed milk. Stir in walnuts, snack mix and coconut. Cover with plastic wrap. Let stand 15 to 20 minutes. Scoop by tablespoonfuls into muffin cups or cookie sheet. Refrigerate 2 hours.