Coffee banana bread

Name: Coffee banana bread
Prep time: 30 min
Cook time: 1 h
Total time: 1 h 30 min
Cuisine: American
Ingredients: 3 very ripe bananas, peeled and roughly chopped; 110g/3¾oz caster sugar (or soft light or dark brown sugar); 2 free-range eggs, beaten; 1 tbsp instant coffee, dissolved in small amount boiling water, or 1 espresso shot; pinch nutmeg (or cinnamon or 1 tbsp finely chopped stem ginger); pinch salt; 85g/3oz unsalted butter, melted, plus extra for greasing; 225g/8oz self-raising flour (or use 225g/8oz plain flour and 1 tbsp baking powder); 100g/3½oz chocolate, broken into small pieces (optional)