Preheat the oven to 350℉/180℃.
Prepare a loaf pan lined with baking paper.
In a large mixing bowl whisk oil, sugar, egg and vanilla until light and fluffy.
Add in mashed bananas and mix to combine.
Using a spatula fold in flour, cocoa powder, salt and baking powder.
When all combined pour in the dissolved coffee and mix.
Mix in about ¾ cup of the chocolate chips.
Pour mixture into the prepared loaf pan and top with remaining chocolate chips.
Bake for 1 hour or until a toothpick inserted into the middle comes out clean.