Pre-heat your oven to 180C (350F)

Sieve all purpose flour, cocoa, baking soda and baking powder together in a big bowl.

In a seperate bowl mix together sugar, oil, salt and vanilla extract and blend until sugar dissolves. Now add 1/4 cup of milk and banana and blend for 2 mins.

Mix your wet and dry ingredients together and add chocolate chips.

Now add the remaining 1/4 cup of milk, adding little milk at a time until all is incorporated

Bake for 20-25 mins or until toothpick comes out clean.