Very simple banana trifle that I've made several times now, my own recipe. No chocolate, no "extra" flavors (I mean you, toffee!).
As given it doesn't make a huge amount, but it's very easy to scale it up for a crowd or down for a single serving. Best made the day before. The time given does not include time for the cake to bake.
For the cake, feel free to use your favorite mix; it'll need about half, as written. The cake needs to be dry, to properly soak up the liquid. Either bake it and slice it the day before, or toast it (sliced) in the oven on low heat for about an hour. Or just use stale cake if you've got any lying around.
You could probably make it with other fruit (raspberries? mangos?) but I haven't tried. If you want a slightly more complex tropical flavor, replace part of the yogurt with coconut milk/cream, or add toasted coconut with the cake.