Place the softened butter in a mixing bowl or the bowl of your mixer. Add the icing/powdered sugar and mix together until smooth
Next add the egg, ground almonds / almond flour, cinnamon and salt to the sugar and butter and mix until well combined. Add the flour a bit at a time and mix until incorporated
Divide the dough into ⅔ and ⅓ portions for the bottom crust(s) and lid(s)
Place the dough for the bottom crust (⅔) onto a lightly floured surface and roll out into a circular shape, a little larger than the pie dish(s) or tart tin(s) you are planning to use. You can use 1 x 20cm pie dish, or 4 to 6 x 13cm tart tins to make individual portions. If making multiple smaller versions, then divide the ball of dough evenly before rolling out
Place the dough into the dish(s)/tin(s) and ensure that the bottom and sides are covered. The pastry is very soft and will most likely break when moving, so patch any holes or cracks if you need to
Remove any excess dough using the rolling pin and/or a small pairing knife. Use any excess pastry to patch up holes, cracks or irregularities if needed
Dock the bottom of the crust with a fork and place it in the freezer for around 30 minutes while you preheat your oven
Repeat the rolling with the ⅓ of dough left and cut into the desired shape(s) you wish to use for the lid, or cut into a round, just slightly larger than the tin/dish. Once rolled and cut, place on a piece of baking paper lined plate or board and place in the fridge to chill until needed
Preheat the oven to 190°C. When hot, remove the pastry case from the freezer, line with baking paper or foil and use baking beans, or dried beans or rice to weigh down the pastry. Make sure that no pastry is visible at this point. Bake for 10 minutes, then remove the baking paper and beans/weights and bake uncovered for a further 10 – 15 minutes. You don't want the pastry to brown or shrink. It is ready when there are no visible 'wet' spots and it turns a light golden. Remove and set aside until filling
Turn the oven temperature down to 180°C
Note: To save time, prepare the sauce and apples either while the crust is chilling or while it is baking