Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      cup           semi-sweet chocolate ships
   1 1/4  cups          graham-cracker crumbs
     1/4  cup           butter -- melted
     3/4  cup           sugar
   1      teaspoon      vanilla extract
     1/2  cup           sugar
   2      tablespoons   sugar
   2      packages      cream cheese -- soft 8 oz size
     1/2  cup           sour cream
   4                    eggs

Preparation:

1. Preheat oven to 325 degrees 2. Combine over hot (not boiling) water, chocolate chips and 1/2 cup sugar; heat until chips melt and mixture is smooth. Remove from heat; set aside. 3. In small bowl, combine graham-cracker crumbs, 2 tablespoons sugar and melted butter; mix well. Pat firmly into 9" springform pan, covering bottom and 1//2 inch up sides; set aside. 4. In large bowl, beat cream cheese until light and creamy. Gradually beat in 3/4 cup sugar. Mix sour cream and vanilla extract. Add egge, one at a time, beating well after each addition. Divide batter in half. Stir melted chocolate mixture into first half. Pour into crumb-lined pan; cover with plain batter. With knife, swirl plain batter with chocolate batter to marbleize. 5. Bake for 50 minutes or until only 2-3 inch circle in center will shake. Cool at room temperatute; refrigerate.