01 - Preheat oven to 350°F. Line a 9-inch square baking pan with parchment paper, leaving an overhang for easy removal.
02 - Combine graham cracker crumbs, melted butter, sugar, and salt in a bowl. Press the mixture 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 - Beat cream cheese and sugar until smooth and creamy. Add eggs one at a time, beating well after each. Incorporate vanilla extract and sour cream. Gently fold in melted white chocolate until combined.
05 - Pour cheesecake filling evenly over cooled crust.
06 - Drop spoonfuls of raspberry puree atop the filling. Swirl gently using a knife or skewer to create a marbled pattern.
07 - Bake for 25 to 27 minutes until the center is set but still slightly jiggly. Avoid overbaking.
08 - Allow to cool to room temperature, then refrigerate for at least 2 hours before slicing into bars.