Preheat your oven to 200°C/180°C(fan)/400°F/Gas 6.
In a bowl, mix 4 Apple, 3 tablespoon Maple syrup, 1 teaspoon Vanilla extract, 1 tablespoon Cornflour (corn starch) and 1 teaspoon Cinnamon until all the apples are coated.
Roll out 375 g Ready rolled shortcrust pastry and put into a greased pie dish. Cut around the edges and save the leftover pastry. Prick the base of the pastry with a fork. Lay the apple slices on the bottom of the pastry and build up in layers.
Roll out the remaining pastry and cut into thin strips. Lay the strips in a lattice pattern over the top of the apples. Cover in foil and cook for 20 minutes.
Remove from the oven, brush 0.5 Egg over the pasty and return to the oven, Cook for a further 20-25 minutes, until golden brown. Cool for at least 30 minutes before serving.
Notes
Why not make this healthy apple pie extra fancy by cutting out some tiny pastry flowers with cookie cutters to put on top.
Fancy something a little different? Swap half the apples for pear, or even make a peach version of this.
Make sure the apples are sliced really thin. If they are on the thicker side, then they won't cook fully in the oven and you will have hard apple slices. You want them to be really soft and sweet.
Although you will be super eager to cut right in to the pie to eat it, you should try to leave it to settle and cool for 2 hours just so that you can cut it and pull out a full slice without it falling apart.