Chocolate Cheesecake

1 1/2 c Graham wafer crumbs
5 tb Butter melted
2 tb Sugar
2 tb Chocolate semi sweetened, grated
3 Eggs
1 ts Vanilla
1 c Sugar
3 pk Cream cheese 8-oz.
12 pk Chocolate semisweet, 1-oz. squares
1 c Sour cream
3/4 c Butter melted Whipped cream (optional) Combine first four ingredients and press into the bottom of a 8-inch springform pan. Beat eggs and sugar with electric beater until a pale mixture.
Mix well. Melt chocolate in double boiler.
Stir in sour cream, butter and vanilla.
Add to cheese mixture and stir. Pour batter into pan. Bake at 325 degrees F for 2 hours or until center is firm. Cool on wire rack. Remove from pan. Chill and serve with whipped cream.