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 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 raspberries break down and sauce thickens, about 5 minutes. Strain through a fine mesh sieve to remove seeds. Let 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 addition. Stir in vanilla extract and sour cream. Blend in melted white chocolate until fully incorporated. Fold in white chocolate chips.
05 - Pour cheesecake filling over crust and smooth the top. Drop spoonfuls of raspberry puree over the filling. Swirl gently with a knife or skewer to create a marbled effect.
06 - Bake for 30 to 32 minutes until edges are set and center is slightly jiggly. Remove from oven and cool to room temperature. Refrigerate a minimum of 3 hours before cutting into bars.