Fill the cooker with salt upto 1 1/2 inches and place a plate on it.
Preheat the cooker for 5-10 minutes on medium flame with the salt.
Take a bowl and add butter, condensed milk and mix well using a whisk.
Now add sugar and again mix it well for few seconds by using whisk.
Take another bowl and add all the dry ingredients in a bowl and mix it well.
Gradually, put the flour mixture into the bowl of wet ingredients and mix well after each addition.
Add milk accordingly and beat till the batter becomes smooth and fluffy.
Take baking tin and sprinkle about a tablespoon of flour. Now swirl the pan so it will stick to greased surface.
Pour the batter into the tin and tap the pan on the counter top to remove bubbles.
Now the batter is ready to bake.
Now, keep the flame on medium low and place the tin with the cake batter inside the cooker.
Close the cooker, remove the whistle and bake the cake on medium low heat for 30-35 minutes.
Check the cake with a tooth pick, the tooth pick should come out clean.
Remove it from the pressure cooker and keep aside to cool for 10 minutes.
Scratch the sides of the pan, invert the tin and tap sharply to unmould the cake .
Let it cool completely before frosting. Your Chocolate cake is ready.
To make chocolate Ganache:
Take a deep bowl and add roughly chopped dark chocolate, whipping cream and microwave it for 15-20 seconds.
Whisk the chocolate and cream with the help of wired whisk.
Now put the cake on wired rack and place the container below the rack to collect the excess chocolate Ganache.
Now start pouring ganache at the center of the cake and cover the entire cake with chocolate ganache.
At last garnish the cake with some choco chips and leaves it to set for 30 minutes.
Cut the eggless chocolate cake into slices and serve.
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. Make sure the butter is always at room temperature before using. If in case you forgot to take out the butter from refrigerator, in that case microwave it for 10 seconds to make little soft.