01 - Preheat the oven to 350°F. Line a 9-inch square baking pan with parchment paper, leaving an overhang on the sides for easy removal.
02 - In a bowl, combine graham cracker crumbs, melted butter, sugar, and salt. Press the mixture firmly and evenly into the bottom of the prepared pan. Bake for 8 minutes, then allow to cool slightly.
03 - In a small saucepan, combine raspberries, sugar, and lemon juice. Cook over medium heat, stirring and mashing until thickened, about 5 minutes. Strain through a fine mesh sieve to remove seeds. Set aside to cool.
04 - In a large bowl, beat cream cheese and sugar until smooth and creamy. Add eggs one at a time, beating well after each addition. Mix in vanilla extract and sour cream. Fold in the melted white chocolate until just incorporated.
05 - Pour the cheesecake filling over the cooled crust and spread evenly. Drop spoonfuls of the raspberry puree over the filling. Use a knife or skewer to gently swirl the raspberry through the filling to create a marbled effect.
06 - Bake for 25 to 27 minutes or until the center is just set but still slightly jiggly. Avoid overbaking.
07 - Cool to room temperature, then refrigerate for at least 2 hours before slicing into bars.