Preheat oven to 190 degrees C. Line baking trays with baking paper.
Mix the sugar and water for the glaze together in a cup and microwave on high for 1 minute. Cool.
Cut four circles out of each sheet of pastry. Fold each circle in half and place on tray. Brush with the glaze and sprinkle with extra sugar. Place in oven and cook until golden brown. Cool completely.
While the pastry cools, blitz or mash apple with the cinnamon and sugar. Whip the cream with the sugar and vanilla.
Split pastry in middle and place one tablespoon of apple mixture into each piece of pastry. Pipe or spoon in whipped cream and dust with icing sugar.
If you don't like apple, replace it with a tablespoon of Nutella.