Cooking a cake in a rice cooker works just fine.
Doing a double batch will take frickin’ forever. Next time I do this, I’m using a single box of mix (or a recipe for one layer, 8″ round (or is it 9″? I can never remember. A regular made-it-at-home size cake.)).
The cake was particularly dense and moist. I think a fluffier texture can be attained by removing the vent plug that slows the escape of moisture during normal rice cooking. So next time I’ll do that.
So, there’s your update. Feel free to go crazy making cakes in your rice cookers. You don’t even have to adjust your recipes.