1 (6 oz.) semi-sweet chocolate morsels
1/2 c. sugar
1 1/4 c. graham cracker crumbs
2 tbsp. sugar
1/4 c. melted butter
2 (8 oz.) pkgs. cream cheese, softened
3/4 c. sugar
1/2 c. sour cream
1 tsp. vanilla
4 eggs

Combine over hot, not boiling water, chocolate and 1/2 cup of sugar. Heat to melt. Set aside.

In small bowl combine cracker crumbs, 2 tablespoons sugar and melted butter. Pat into 9 inch springform pan covering bottom and 1 inch up sides.

Beat cream cheese until light and creamy. Gradually add 3/4 cup sugar and beat until smooth. Mix in sour cream and vanilla. Add eggs, one at a time, beating well. Divide batter in half. Stir melted chocolate mixture into first half. Pour into crumb-lined pan. Cover with remaining batter. With a knife, swirl batter to marbelize. Bake 40 to 50 minutes in 325 degree oven. Cool at room temperature.