8 1/2 oz Chocolate Wafers, Fine Crush

    1/2 c  Butter, Melted

     12 oz Semi-sweet Chocolate Chips

  1 1/2 c  Heavy cream

     16 oz Cream Cheese, Softened

    1/4 c  Sugar

      4 ea Large Eggs

      1 ts Vanilla Extract

    1/2 c  Heavy Cream Whipped (Opt.)

  In large bowl, combine chocolate wafer crumbs and butter. Pat fimly into
  9-inch springform pan, covering bottom and 2 1/2 inches up sides. Chill.

  Preheat oven to 325 degrees F. Combine over hot (not boiling) water,
  chocolate chips and heavy cream. Stir until morsels are melted and mixture
  is smooth. Set aside. In large bowl, combine cream cheese and sugar,
  beating untl creamy. Add eggs, one at a time, beating well after each
  addition. Add chocolate mixture and vanilla, mix until blended. Pour into
  prepared crust. Bake at 325 degrees F. for 60 minutes. Turn oven off. Let
  stand in oven with door ajar 1 hour. Remove, cool completely. Chill 24
  hours. Decorate edge with whipped cream, if desired.