Preheat the oven to 350 degrees F and line a 8X8 baking pan with parchment paper or foil.
Crush up the graham crackers in a food processor to make graham cracker crumbs.
Mix together the crust ingredients in a medium size mixing bowl. Then press this mixture into the bottom of the 8X8 baking pan.
Then cream together on high with a hand held mixer or stand up the mixer, the cream cheese, flour and sugar until the mixture is light and fluffy.
Reduce the speed to medium and add in the sour cream, eggs, lemon juice, vanilla and salt. Mix until well combined and the mixture is smooth.
Spread the cream cheese mixture onto of the crust in the 8X8 baking pan.
Drop spoonfuls of the raspberry jam onto the cream cheese mixture. Use a knife to gently swirl the jam into the cream cheese mixture.
Bake uncovered for 35-40 minutes until set and slightly firm.
Allow the mixture to cool completely at room temperature and then chill in the refrigerator before cutting and serving. Chill the bars for a minimum of 4 hours but overnight is ideal so that they can fully set.