01 - Preheat oven to 325°F. Line an 8-inch square baking pan with parchment paper, leaving overhang for removal.
02 - Combine graham cracker crumbs, sugar, and melted butter in a medium bowl. Press firmly into the bottom of the pan. Bake for 8 minutes, then cool slightly.
03 - In a small saucepan, cook raspberries, sugar, and lemon juice over medium heat, stirring and mashing until thickened (about 5 minutes). Strain through fine mesh sieve to remove seeds. Cool.
04 - Beat cream cheese and sugar until smooth. Add eggs one at a time, mixing well after each. Stir in vanilla and sour cream. Blend in melted white chocolate. Fold in white chocolate chips.
05 - Pour filling over crust and smooth top. Drop raspberry puree by spoonfuls and gently swirl with knife or skewer to create marbled effect.
06 - Bake 30–32 minutes until edges are set and center is slightly jiggly. Cool to room temperature, then refrigerate at least 3 hours before slicing.