No-Bake Cheesecake Truffles

Beat cream cheese, butter and vanilla in medium bowl with mixer until blended. Gradually add sugar, mixing well after each addition. Freeze 1 hour or until cream cheese mixture is firm enough to handle. Shape cream cheese mixture into 40 balls, using about 1 rounded tsp. cream cheese mixture for each ball. Place in single layer in shallow pan; refrigerate 15 min. or until firm. Melt chocolate as directed on package. Dip bottom halves of cheese balls, 1 at a time, in graham crumbs; place, crumb sides down, on waxed paper-covered plate. Drizzle with melted chocolate; refrigerate 15 min. or until firm.