01 - Preheat oven to 325°F. Line an 8-inch square baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium bowl, combine graham cracker crumbs, sugar, and melted butter. Press firmly into bottom of prepared pan. Bake for 8 minutes, then set aside to cool slightly.
03 - In a small saucepan, combine raspberries, sugar, and lemon juice. Cook over medium heat, stirring and mashing, until raspberries break down and sauce thickens, about 5 minutes. Strain through a fine mesh sieve to remove seeds. Allow to cool.
04 - In a large bowl, beat cream cheese and sugar until smooth and creamy. Add eggs one at a time, mixing well after each. Stir in vanilla extract and sour cream. Incorporate melted white chocolate until combined. Fold in white chocolate chips.
05 - Pour cheesecake filling over crust and smooth the surface. Drop spoonfuls of raspberry puree onto filling and gently swirl with a knife or skewer to create a marbled effect.
06 - Bake for 30 to 32 minutes until edges are set and center slightly jiggles. Remove from oven and cool to room temperature. Refrigerate for at least 3 hours before slicing into bars.