To make crust, crush wafers. Add melted butter to make crumbly dough. Press into bottom of 9 - inch spring form pan. Set aside.

Filling
Ingredients:
1 Tbsp. butter or margarine
3 ounces unsweetened chocolate
9 ounces semisweet chocolate
4 (3 ounces) packages cream cheese, softened
2 Tbsps. vanilla
1 cup whipping cream
6 eggs
3/4 cup sugar
Whipped Cream (optional)

To make filling, melt butter in top of double boiler over hot water. Add chocolates and heat until melted, stirring until smooth. Beat cheese until creamy. Add vanilla and whipping cream. Stir in chocolate mixture. Beat eggs with sugar and slowly beat into chocolate mixture. Turn into crust and bake at 350 degrees F 40 - 45 minutes, or until cake puffs slightly in center. Cool, then chill thoroughly before unmolding. Serve with whipped cream, if desired.