1. Preheat the oven to 200°C (390°F). Line muffin tins* with cupcake paper liners* and set aside.

2. Mix the flour with cocoa powder, baking powder, baking soda and salt. Set aside. Melt the butter and let it cool down again. Mash about 1 1/2 of the bananas and slice the rest so you get about 16 slices. Chop the chocolate.

3. In a large bowl mix the sugars with the melted butter until well combined. Add the buttermilk, eggs and maple syrup and mix until well combined. Add the flour mixture and mix slowly until just combined. Finally, add the mashed banana and about 2/3 of the chopped chocolate and fold in.

4. Fill the batter into the prepared muffin tins about 3/4 full. Sprinkle with the remaining chocolate and place a slice of banana on each muffin and bake for about 18-20 minutes or until a toothpick inserted into the center of the muffins comes out almost clean. Take them out of the oven, let them cool down a bit in the muffin tin, then remove them and let them cool down completely on a wire rack.