Preheat the oven to 350°F (175°C).
In a medium bowl, combine the graham cracker crumbs and melted butter.
Press the crumb mixture into the bottom of a 9-inch springform pan.
Bake the crust for 10 minutes, then let cool.
In a saucepan, dissolve gelatin in cold water and let sit for 5 minutes.
Heat the gelatin mixture gently until fully dissolved, then remove from heat.
In another bowl, beat cream cheese and powdered sugar until smooth.
Add melted white chocolate and vanilla to the cream cheese mixture, mixing until well combined.
In a separate bowl, whip heavy cream until stiff peaks form.
Fold the whipped cream into the cream cheese mixture gently.
Add the dissolved gelatin to the mixture, stirring until fully incorporated.
Pour the mousse over the cooled crust and spread evenly.
Chill the cheesecake for at least 4 hours, or overnight if possible.
Spread cranberry jam generously over the top before serving.