Cook cranberries, sugar, and vanilla for 15 minutes until thickened.
Mix crust ingredients and press into a springform pan.
Spread half the jam on the crust.
Beat cream cheese and sugar until smooth.
Add sour cream, vanilla, eggs, cornstarch, and cream.
Pour the cheesecake filling over the jam.
Bake at 325°F in a water bath for 70 to 75 minutes.
Cool, then refrigerate for at least four hours.
Spread remaining jam on top.
Make mousse by mixing cream cheese with melted white chocolate, then fold in whipped topping.
Spread mousse over cheesecake and decorate.