Preheat the oven to 200c / 180c / 400f / gas mark 6.
Unroll the shortcrust pastry.
Cut circles with a cookie cutter or glass and place half of them on a lined baking tray.
Spread the other half of circles out on the paper the pastry was rolled in. I managed 14 circles (7 pies), by rerolling the pastry trimmings, but it will vary depending on the size of your pastry and cutter (see notes).
Decorate the lids, if you wish to do so (see notes).
Place a dollop of apple filling in the centre of each pie, leaving a border. I added a heaped teaspoon of sauce to each pie.
Rub a little water around the border, to help the lid stick.
Dust with the apple mixture with cinnamon.
Add the lid, using your thumb or finger to press down around the edges to seal. You can use a fork, which will leave a nice pattern.
Do the same for as many pies as you can make using the pastry and filling (will vary according to size of pastry sheet and cutters).
Once sealed, you can cut a couple of air holes or slits to let out steam. I didn't this time and they were fine.
Brush with milk, then sprinkle sugar over the pies.
Bake for about 20 minutes, until lightly golden.
Serve and enjoy!