Preheat oven to 325°F (163°C). Line an 8x8 inch baking pan with parchment paper.
In a bowl, combine graham cracker crumbs and melted butter until moistened.
Press crust mixture firmly into the bottom of the prepared pan.
In a large mixing bowl, beat cream cheese and sugar until smooth and creamy.
Add eggs one at a time, mixing well after each addition.
Mix in sour cream and vanilla extract until fully combined.
Pour cheesecake batter over the crust and smooth the top.
Warm raspberry jam slightly and drop spoonfuls onto the cheesecake batter.
Use a toothpick or skewer to swirl the jam into the batter.
Bake for 35-40 minutes, or until the center is set.
Cool to room temperature, then refrigerate at least 3 hours before slicing.