Ingredients:

DRY:
Granulated white sugar 2 cups (400 grams)
All purpose flour 1 3/4 cups (245 grams)
Unsweetened cocoa powder 3/4 cup(75 grams)
Baking powder 1/2 teaspoons
Baking Soda 1 1/2 teaspoons
Salt 1/2 teaspoon

WET:
Eggs 2 large
Ripe bananas 1 cup mashed(about 2 medium ones)
Warm water 1 cup (240 ml)
Milk 1/2 cup (120 ml)
Oil 1/2 cup (120 ml) (any flavorless oil)
Pure vanilla extract 1 1/2 teaspoons

Method:
Preheat the oven to 350 degree F. Place the rack in the centre of the oven.
In a bowl mix together all the dry ingredients, and sieve it 2 -3 times with a sieve.
In another bowl mix all the wet ingredients and mix thoroughly.
Pour the wet mix over the dry one slowly and mix nicely.
The batter is ready; it should be quite thin in consistency, easy pouring one.
Pour the batter in a pre greased baking pan, and bake it for about 35-40 minutes.
Do check with a skewer , if inserted in center comes out clean , its done.
Remove it from the oven and let it cool before taking it out from the pan.

Tips:

Never open the oven in between, at-least in the starting 25-30 minutes.