Preheat the oven to 175 deg. C (350 deg. F) and grease or spray and cook the 13 x 9″ dish. Set aside.
BASE: In a blender pulse the flour, sugar and the cold butter. Until it becomes crumbly.
In the baking dish, press this shortbread dough mixture evenly over the bottom of the dish.
Bake the shortbread base in the heated oven for 20 minutes.
SAUCE: In a pot on the stove top, make the blueberry sauce for cheesecake topping. Firstly add your cornstarch with the 3 Tablespoons of water in a jug and mix to a paste. put aside.
Add your blueberries, sugar, lemon juice and 1/2 cup of water in a pot and heat up. Stir continuously, and break up the blueberries. Bring this mixture to a boil.
When it is boiling add your cornstarch paste, and keep stirring until combined. only for 1-2 minutes. The mixture should thicken. You can tell when it sticks slightly to your spoon or when you pull it across the bottom of the pot it leaves a line. Take the sauce off the stove and leave to cool. The sauce will thicken more as it cools.
CRUMBLE: To mix the crumbled topping. In a bowl hand mix the soft butter, brown sugar and flour until it resembles course crumbs. (use a fork)
FILLING: In a mixer, blend the the cream cheese and sugar until smooth. Add your lemon juice, and eggs and the vanilla and mix until it is combined and smooth.
ASSEMBLE:
Once the shortbread has cooled a little, add in even layers, your cheesecake mixture, and top with enough blueberry sauce. (you don’t have to make a thick topping, as the sauce will make two cups). Also add your crumbed mixture(no 8) on top and sprinkle a few almond flakes.
BAKE: in the oven for 25 minutes.
Leave to cool on a cooling rack and once cool place in the refrigerator for an hour.
Before you serve sprinkle some fresh blueberries on the top of the bars, and then slice and serve for a delicious fresh dessert.