Preheat your oven to 180 C/ 350 F. Grease the cavities of a muffin tray and dust with cocoa powder well.
Whisk together the flour, baking soda , salt and cocoa powder in a bowl.
Dust the chocolate chips / chunks with a tablespoon of this flour mixture. Keep aside.
In another bowl , mash up your bananas. Add to this, the oil , sugar , vanilla and curd.
Whisk the dry and wet ingredients together until just combined . Do not over mix.
Fold in the dusted chocolate chips / chunks.
Fill the muffin tray cavities about 3/4 th full and sprinkle more chocolate chips on top if you want.
Bake at 350 F/ 180 C for 20 - 25 minutes until a toothpick inserted comes out dry.
Cool in pan for 5 minutes , then remove and cool completely.