It's made in the Rice Cooker Plus. So if you search for Rice Cooker recipes, it will be among the other recipes.
It's basically a boxed cake and half a can of frosting. Make the cake mix in the cooker and drop dollops of the frosting over the mix (in center). Cook in micro for about 9 minutes. You should have a rotating tray in the micro.
Turn over onto a plate that is NOT flat (lava will spill over!).