Crumble all the biscuits well, then mix them with the butter. Pour the mixture into a cake form and form a layer using a wooden spoon.
Bake for about 10 min. in a preheated 356°F (180 °C) oven. In the meantime, prepare the cream for the cheesecake. Mix all the ingredients for it and beat. Pour the resulting cream over the cake layer and return the dessert to the oven.
Bake about 35 min. on low heat. Then take it out and leave it to cool. Put it in the fridge for 3 hours. Pour the slightly heated blueberry marmalade over it.