How can I bake muffins without an oven?
You can actually steam a lot of cakes. The basic idea is seal the cake pan tightly with foil (or even plastic wrap if your can handle the temperature) and then place it in your steamer insert/basket. I find it takes about 40 min for it to cook all the way through. Makes for a super moist and fluffy cake.
Here’s a random example I found online.
Paper in reference to streaming gluten free cakes (which is where I first got the idea)