01 - Preheat oven to 325°F. Line an 8-inch square baking pan with parchment paper, leaving an overhang for easy removal.
02 - Combine graham cracker crumbs, sugar, and melted butter in a bowl. Press the mixture firmly into the bottom of the prepared pan. Bake for 8 minutes, then cool slightly.
03 - In a small saucepan, combine raspberries, sugar, and lemon juice. Cook over medium heat, mashing and stirring until thickened, about 5 minutes. Strain to remove seeds and cool.
04 - Beat cream cheese and sugar until smooth. Add eggs one at a time, incorporating well. Mix in vanilla and sour cream. Stir in melted white chocolate until combined, then fold in white chocolate chips.
05 - Pour filling over crust and smooth surface. Spoon raspberry puree over filling and swirl gently with a knife or skewer to create marbling.
06 - Bake for 30–32 minutes until edges are set and center jiggles slightly. Cool to room temperature, then refrigerate at least 3 hours before cutting into bars.