In large bowl, combine chocolate wafer crumbs and butter; pat firmly into 9-inch springform pan, covering bottom and 2 1/2 inches up sides, then chill.
Preheat oven to 325 degrees.
Combine over hot (not boiling) water, chocolate chips and heavy cream; stir until morsels are melted and mixture is smooth then set aside.
In large bowl, combine cream cheese and sugar, beating until 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 for 60 minutes.
Turn oven off and let stand in oven with door ajar 1 hour; remove, cool completely then chill 24 hours - Decorate edge with whipped cream, if desired.
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