My oven's got its own ideas about things, so I set it to 200℃, and cook for an hour.
Lots of recipes online blend the ingredients together, but I haven't tried that.
In case you don't know: there are certain apples that are good for cooking, generally ones that are a bit sour like Granny Smith.
In Italy you can by little packets of lievito, and the dessert ones have vanilla in them.
Wholemeal flour could be nice, maybe half-half.
Lots of recipes online top the cake with icing sugar, but that seems like overkill to me.
Originally I used a less complex method: dry stuff, eggs, oil, apples…
Cinnamon's an obvious spice to try adding. I've tried lemon myrtle and wattle seed, and that was a nice combo.