This makes a deliciously moist yet light sponge desert and is perfect served with pouring of double cream. A good alternative to apple pie. I make it without the cinnamon as my husband doesn't like the taste, and it is very good.
Preheat the oven to 200c/390f/gas mark 6. Line a cake tin with greaseproof paper.
Using a whisk (electric or manual), whisk the eggs, caster sugar and vanilla extract in a large bowl until the mixture is thick and mousse like and the whisk leaves a figure of eight pattern.
Melt the butter in a saucepan with the milk, then pour onto the egg and sugar mixture, whisking all the time. Sift the flour, cinnamon and baking powder and fold carefully into the mixture so that there are no lumps of flour. Pour the mixture into the prepared tin and smooth the surface.
Arrange the apple slices over the batter (they will sink during cooking). Sprinkle over a tablespoon of sugar and bake in the oven for 10 minutes, then reduce the oven temperature to 180c/350f/gas mark 4 and bake for a further 20-25 minutes or until well risen or goldne brown.
Remove the cake from the oven and allow to cool a little. Serve warm with double cream. Any left overs can be eaten cold or can be warmed in the microwave well, just for a few seconds.