Preheat the oven to 180 Deg C (350 F).
Grease the muffin pans with oil or butter. I used paper cups.
Sieve together flour, baking soda, cocoa together and keep it aside.
Mash the bananas well using a fork or masher.
Add eggs, vegetable oil and whisk till incorporated.
Add brown sugar and mix well.
To this wet mixture add the sieved dry flour mixture in two batches and keep mixing with a spatula to get a thick batter.
Spoon the batter into the prepared muffin cases.
Bake for 15-20 mins or till a skewer inserted comes out clean.
Transfer to a wire rack and let it cool completely.
Chocolate Banana Muffins are ready.
Enjoy as your morning breakfast with a glass of milk or pack for your kids snack box.