Preheat the oven to 180C.
Whisk together the flour, cocoa powder, coconut sugar, baking powder, baking soda and salt into a bowl.
Add roughly chopped chocolate, chocolate chips and give it a stir.
In another bowl whisk the eggs, oil, buttermilk, coffee and vanilla essence.
Add wet ingredients to the dry ingredients and gently fold with a rubber spatula till combined.
Do not overmix.
Grease the muffin moulds with oil, ladle the batter to the cups and bake at 180C for 18-20 minutes or till a skewer inserted into the center of a muffin comes out clean.
Transfer to a wire rack and allow to cool to room temperature.