1For crust in mixing bowl, stir together crushed wafers and butter or margarine, Press mixture evenly over bottom and 1 3/4 inches up sides of a 9 inch springform pan. Put pan in shallow baking pan. For filling, in large bowl, beat cream cheese, sugar, the 4 squares melted chocolate, flour and vanilla till well mixed. Add eggs all at once, then beat with mixer on low speed just till mixed. Do not overbeat. Stir in milk. Pour filling into crust. Bake at 350 for about 45 minutes or til center appears nearly set when gently shaken. Cool on wire rack for 5 to 10 minutes. Loosen sides of cheesecake from pan Cool about 30 minutes. Remove sides of pan. Cover and chill 4 to 24 hours. For star design, if desired, put melted vanilla flavored pieces in pastry bag fitted with small round tip or in small plastic bag with corner snipped. Pipe melted vanilla flavored pieces into stars on top of cheesecake. In small pan, melt the 1 square chocolate and shortening over low heat. Pipe into stars as directed above or drizzle over top of cheesecake. Chill til chocolate is set.