Take a pressure cooker, add some salt at the base and spread it evenly all over the base.

Cover the cooker with a lid.

Preheat the cooker for about 10 minutes on low flame.

Take a cake pan, grease the cake pan with some butter all over the pan at the sides and edges.

Take some flour and spread the flour all over the pan.

Place the greased and floured pan aside.

Take a bowl, add condensed milk, add oil and mix the batter well.

Add powdered sugar, maida/all purpose flour, cocoa powder, baking powder, salt.

Gradually add milk and mix the batter well without any lumps.

Add vanilla extract and mix again.

The batter should be of milkmaid consistency.

Take the greased and floured cake pan.

Pour the cake batter from the centre.

Tap the cake pan slightly.

Open the cooker lid.

Place the cake pan inside the cooker.

Cover it with the cooker lid.

Do not put any whistle.

Bake the cake for about 70 minutes on low flame.

Take a tooth pick and insert into the cake.

If the cake comes out clean, cake is done well, else bake the cake for few more minutes and do a tooth pick test.

Switch off the flame.

Take the cake pan out and allow it to cool down for few minutes.

Run a knife at the sides and at the edges.

Invert the pan, pat the pan slightly.

Carefully lift the pan and be careful while taking the cake out.