MICROWAVE CAKE:
Add all the dry ingredients in a bowl and mix. Add the oil and a bit of the soy milk, now you'l have to mix it well if you don't want any flour crumbs (or watever how you call it), after mixing it well add the rest of the soy milk and mix it well again. Now microwave it for 2 minutes (it depends of the potency of the microwave) you'll have to keep your eye on the microwave so the cake doesn't get dry...
ICE CREAM:
Add the cornstarch, sugar and vanila essence on a saucepan and slowly add the soy milk while mixing, put it on medium heat and let thicken, never stop mixing it. Put it on a recipient let it cool down and put it on the freezer. Wait around 20 minutes.
Put it together:
Now with a spoon make balls of cake, cut them in half and put some ice cream between, put it again on the freezer and wait other 20 minutes. And now its ready to serve. (You can also keep it in a box on the freezer.)
Source of recipe: I was playing around in the kitchen, and this is what I came up with. I honestly have tried a lot of microwave chocolate cake, recipes and I didn't like any of them, so I made my own recipe. I think the trick is to mix different tipes of chocolate, I use cocoa and chocolate powder.