Start with the blueberry compote: In a saucepan, combine blueberries, 1/2 cup sugar, and lemon juice. Simmer over medium heat until the berries burst and the mixture thickens, approximately 10-12 minutes. Set aside to cool.
For the biscuit base, mix the crushed biscuits or crackers with the melted butter until the texture is like damp sand.
Whip the softened cream cheese with 1/4 cup sugar, vanilla extract, and lemon zest in a mixing bowl until smooth and creamy.
In another bowl, whip the cream until stiff peaks form. Gently fold this into the cream cheese mixture to create a smooth cheesecake filling.
Assemble the jars: Begin with a layer of the biscuit base, press down lightly. Follow with a generous dollop of cheesecake filling, and top with the cooled blueberry compote.
Seal the jars and refrigerate for at least 3 hours, allowing the flavors to meld and the cheesecake to set.