Sieve atta and baking soda together. Keep aside.
Mix brown sugar, olive oil and jam together. Use a blender to do so. Add mashed bananas, whiz the blender till the banans are pureed.
Now, add eggs and vanilla essence and blend again for 3-4 seconds.
Gradually mix the flour with the banana mixture. Mix till the batter is smooth.
Grease the cake tin and dust it with a little flour.
Pour the mixture in the tin and bake at 180 degree Celsius for 25-30 minutes in an oven.