CRUST:

1 c. graham wafer crumbs
1/4 c. dry unsweetened cocoa
2 tbsp. granulated sugar
1/4 c. melted butter

Combine graham crumbs, cocoa and sugar; blend in butter. Press onto bottom of 9 to 10-inch springform pan. Chill while making filling.

FILLING:

1 1/2 lbs. cream cheese
1 c. granulated sugar
3 eggs
2 tsp. vanilla
4 squares (1 oz. each) semi-sweet chocolate, melted

Beat cream cheese until smooth. Gradually beat in sugar. Beat in eggs, one at a time, at low speed; add vanilla.

Pour half of cheese mixture (about 2 cups) into another bowl; add melted chocolate and blend well. Pour 1 cup white cheese mixture on top of prepared crust; spread smoothly. Drizzle 1 cup chocolate mixture on top; spread gently. Top with remaining white mixture; spread very gently.

GLAZE:

4 squares (1 oz. each) semi-sweet chocolate
1/4 c. butter

Melt chocolate and butter. Drizzle mixture on top as evenly as possible. Using a small spatula or knife, gently stir batter to make marbled design.