Fill the cooker with salt upto 1 1/2 inches and place the plate or any stand on top of it.
Preheat the cooker for 5-10 minutes on medium flame with the salt.
Take a bowl and add all the dry ingredients (all-purpose flour, icing sugar, chocolate powder, cocoa powder, baking soda, pinch of salt) in a bowl and mix it well.
Take another bowl and mix all the wet ingredients
Gradually put the flour mixture into the bowl of wet ingredients and mix well after each addition.
Put vanilla essence at the time of last addition of dry mixture and mix it well.
Beat the batter until smooth.
To make cupcakes in pressure cooker take paper tea cups and cut them into halves.
Now take your favorite cupcake liners or silicon mould and insert them into the tea cups by pushing them gently.
Place all the moulds with tea cups in the cake pan and pour the prepared batter into these silicon moulds.
Put some choco chips on top and place the cake pan carefully over the stand inside the pressure cooker.
Close the cooker, remove the whistle and bake the cake on medium heat for 30-35 minutes.
Remove from flame, tear off the paper tea cups and set aside until cupcakes cool down.
Take out the chocolate cupcakes from the silicon mould when it is cool down.
Video
Notes
Do not use the rubber gasket. You can use sand instead of salt. Do not pour water inside the cooker as we are not steaming the cake. Do not heat empty cooker without the salt as your cooker will get damaged.