Pre-heat the oven to 190°C.
In a large bowl, using a spatula, mix together the Saint Agur Blue Cheese, beaten egg, ground almonds and icing sugar until you have a smooth paste.
Add the flour, grated apple, dried cranberries and ground cinnamon. Mix again until you have an even mixture.
Using the 9cm pastry cutter, cut out 20 discs and set to one side. You may need to roll out the trimmings to ensure you have enough discs.
Using a pastry brush, lightly brush the edge of 10 discs and arrange them onto 2 trays lined with greaseproof paper.
Spoon 50g (2 x large tablespoons) of the mixture into the centre.
Cover with the remaining discs of pastry and press firmly to seal the edges.
Brush the top of each with the remaining beaten egg and sprinkle with caster sugar.
At this stage you can freeze the pithiviers and bake them from frozen as and when you need them. Or simply bake a couple now and reserve those remaining in the freezer for a later date.
Bake the pithiviers in the oven for 25 minutes until golden brown.
Leave to cool for 5 minutes before dusting with icing sugar and serving.