Firstly mashed banana with fork.in another bowl add flour,baking powder,baking soda mix well.

In mashed banana add oil and mix well for 5 min till oil get dissolve in bananas than add dry ingredients again mix well if mix looks little dry add milk and mix well

Than pour the mixture in well freezed tin and bake it for 15 -20 min at 180'c

If you wish you can add chocochips like I am added.