1 c. chocolate wafer crumbs
1/4 c. butter, melted
1 (12 oz.) pkg. semi-sweet chocolate morsels
3 (8 oz.) pkgs. cream cheese
3/4 c. sugar
3 eggs
1 (8 oz.) carton sour cream
5 tbsp. whipping cream
2 tsp. vanilla extract

Combine chocolate wafer crumbs and butter, mixing well; press firmly into bottom of a 9 inch springform pan.

Place chocolate morsels in top of double boiler; bring water to a boil. Reduce heat to low; cook until chocolate melts.

Beat cream cheese with electric mixer until light and fluffy, gradually add sugar, mixing well. Add eggs, one at a time, beating well after each addition. Stir in melted chocolate and beat until blended. Stir in next 3 ingredients (mixture may appear slightly lumpy). Pour into prepared pan. Bake at 350 degrees for 45 minutes (center may be soft but will firm when chilled). Let cool. to room temperature on a wire rack; refrigerate overnight.