Kitchen blunder -burnt cake

After ages I was trying baking a cake in a pressure cooker instead of my convection microwave oven.
I was really lazy to do anything but desperately wanted to have a home baked cake.

Given that I was not in a state to bake a cake and forgotten how to use the pressure cooker the cake was bound to go wrong and it did because I increased the heat to max much before I place the batter in and it remained high through out thus burning the outer part with and uncooked inside!