WhatsApp challenge recipe #7: Banana chocolate rum cake

Collating a bunch of recipes received from family and friends during a WhatsApp forward challenge. Haven't tried this one yet.

Ingredients
Eggs 3
Butter 150 g
Brown sugar 100g
Caster sugar 100g
Vanilla essence 1tsp
Flour 225g
Baking powder 1.5 tsp
Banana 3
Chocolate chopped 150g
Captain Morgan rum 120ml

Courtesy: Anonymous (sent to Jayalakshmi, Mysuru)