01 - Preheat oven to 325°F. Line a 9x9-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - Combine graham cracker crumbs, sugar, and melted butter in a bowl. Press mixture firmly and evenly into the bottom of the prepared pan. Bake for 10 minutes, then allow to cool slightly.
03 - In a small saucepan, mix raspberries, sugar, and lemon juice. Cook over medium heat, stirring and mashing until the raspberries break down and the mixture thickens, about 5 minutes. Strain through a fine mesh sieve to remove seeds and let cool.
04 - Beat cream cheese and sugar in a large bowl until smooth and creamy. Add eggs one at a time, mixing well after each addition. Stir in vanilla extract and sour cream. Fold in melted white chocolate until just combined.
05 - Pour cheesecake filling over cooled crust. Spoon raspberry puree atop filling and gently swirl with a toothpick or skewer.
06 - Bake for 30 to 35 minutes, until the center is just set and edges slightly puffed. Avoid overbaking.
07 - Cool completely at room temperature, then refrigerate for at least 3 hours before cutting into bars.