Mix egg with salt and beat it till fluffy (can use beater)
Add oil and powdered sugar,beat again
Add vanila essence, blend finally for 10 more seconds.keep aside
Mash bananas with a fork, gently mix it with the egg batter with the fork
Mix wheat flour and baking powder and filter it with a flour filter ,mix slowly to the egg batter, mix well with fork till the lumps disappears.
Grease the pan with butter ,place butter paper in it, fill the bowl with 3/4 th
Pre heat the cooker for 5 minutes
Add 5_10 tbsp of salt to the cooker base to cover evenly , ( this helps the purpose of oven , maintain steady heat)
Keep a plate over the salt, and cover the lid of cooker without whistle weight for 5 minutes.
Slowly open the cooker lid, carefully place the bowl of batter over the hot plate, take extreme care .close the lid .
Wait for 35 to 45 minutes , check the cake with a toothpick, if it comes out clean ,its ready
Take it out of cooker slowly , take the cake upside down.let it cool for 20 minutes.