Mmm like the sound of apple cake. Is that the one that's sponge with sliced apple on top? I love sponge cake full stop but with apple, even better. What I usually do is an ordinary Victoria sponge batter (the one that’s equal weights of eggs, sugar, flour, fat - is that Victoria sponge?) poured over some pre-softened apples in chunks. If there’s not many apples, it holds together as a sliceable cake. If there’s lots more apples than sponge, I think it’s Queen of Puddings. Sometimes I chuck a clove in with the apples or put cinnamon in the sponge, or use brown sugar not white.
Also make a grape cake which is Victoria sponge with some vanilla essence, half the batter into the tin, then a layer of grapes, then the rest of the batter on top.
Cook till the usual test, of the cake bouncing back if you depress it with a finger tip.
All of these can be cooked in a microwave if I’m short of time. Don’t look so pretty, so dish up as slices on their side, or, for the apple cake, turn upside down so the fruit’s on the top.
or you could be fancy and slice the apples and arrange in a nice spiral pattern in the bottom of the tin, sponge cake on top, then turn it out upside down.