Microwave Brownie Cake
This recipe is enough for one 1/2 cup serving of cake (roughly) or two 1/4 cup mug cakes, doled into separate mugs after mixing.
Do not use more baking soda than recommended. The cake will rise too much.
You will need to soak whatever mug you use - this stuff dries on pretty tough. Setting it out overnight with water in the mug typically gets it off though.