FILLING:

1/2 c. chocolate wafer crumbs
1 tbsp. softened butter
3 (8 oz.) pkg. cream cheese
1 c. sugar
1 1/2 tsp. vanilla
5 eggs
2 sqs. semi-sweet chocolate, melted

In a small bowl, combine crumbs and butter. Lightly grease a 9 inch springform pan. Press crumb mixture evenly over the bottom. Preheat oven to 300 degrees. Put cream cheese, sugar and vanilla in a large mixer bowl. With mixer set at medium speed, beat cheese mixture until smooth. Add eggs, one at a time, beating well after each addition. Set 1 cup of cheese mixture aside; pour rest into prepared pan. Fold melted chocolate into the cup of reserved cheese mixture.

Spoon into pan and cut through in a spiral motion for a marble effect. Bake 50-55 minutes or until set. Remove to wire rack and cool completely. Chill for 2 hours.