1Place cheeses in medium bowl; let stand at room temperature about 30 minutes or until softened. Beat onion and Worcestershire sauce into cheeses with electric mixer on low speed until mixed. Beat on medium speed 1 to 2 minutes, scraping bowl frequently, until fluffy. Cover and refrigerate at least 8 hours until firm enough to shape into a ball.
2Shape cheese mixture into 1 large ball. Roll in parsley; place on serving plate. Cover and refrigerate about 2 hours or until firm. Serve with crackers.