White Chocolate Cheesecake

1 lb White chocolate; chopped
12 oz Cream chesse; room temp
2 Egg yolks
1 c Sour cream
1 ts Vanilla
3 Egg whites
1 ts Cream of tartar
2 tb Superfine sugar Melt chocolate; set aside beat cream cheese untill fluffy-beat in egg yolks
1 at a time and mix well, mix in sour cream, vanilla, chocolate and set aside
Beat egg whites w/tartar untill peaks-gradually add sugar, beat till stiff.
Stir 1/3 of the whites into chocolate mix (to lighten) then fold in remaining whites. Spoon into a pan with a graham cracker crust and bake in a water bath till center is set.