Take a 5-liter pressure cooker and put 11/2 cup salt into it.
Spread the salt and put wire rack or any plate onto the salt, this prevents the cake for burning from downwards.
Put the lid of the cooker on top, remove the whistle and to heat the salt keep the cooker on medium flame for 10 minutes. Meanwhile, let's prepare the cake batter.
Put the biscuit in a jar and grind it to make powder of it. Do not discard the cream of biscuit.
Put biscuit powder in a bowl and add powdered sugar as per sweetness.
Add milk and make a thin batter.
To enhance the taste add some choco chips and mix it well. It's not necessary to add choco chips.
The batter is ready now. Let's prepare the cake tin before adding Eno. Always add Eno at last otherwise it's bubbly effect will go away and cake will not become soft and spongy.
Take 6 inches round tin and grease the tin with oil all around.
line the tin with parchment paper so that cake will come out easily after baking. grease the parchment paper with oil.
Lastly, add Eno and quickly mix it well.
Pour the batter immediately into the greased tin and tap the tin so that batter gets spread evenly and air bubbles get removed.
put some choco chips on top and put the cake tin inside the heated pressure cooker onto a wire rack.
Cover the lid, remove the whistles and bake the cake for 35 to 40 minutes or till it gets fully baked. Let the cake bake on medium-low flame.
After 45 minutes uncovered the lid and check the cake by inserting a knife or fork. If the fork comes out clean it means cake gets fully baked from inside.
Now take out the cake tin carefully from the pressure cooker and let the cake cool down for some time.
once cool, scratch the sides and invert the cake tin onto a plate.
Remove butter paper and let the cake cool down before cutting.
Garnish with some colorful sprinkles. you can use choco chips or chocolate syrup for garnishing.