Apfelstreuselkuchen

I made this cake once, about twelve years ago - I definitely wasn't as demanding culinarywise then as I am now, it appears. The cake is fine but a little boring. It features a fairly standard sponge, a few apples on top, then topped off by (the only interesting feature!) a nice crunchy crumble.

I actually forgot the cake in the oven - I baked it 1 hour and 15 min instead of the required 45 min, but that didn't seem to do any harm.

I think you could spruce it up, a little, by making the sponge layer thinner and adding in some spices - I'm thinking cardamom, but maybe also some chili?