Preheat oven to 180°C bake.
Grease or line 6 extra large muffin tins or 12-15 medium muffin tins.
Beat the eggs and Chelsea White Sugar together.
In a separate bowl, combine the flour, cocoa powder, baking powder and salt.
Add to egg/sugar mixture. Stir to just combine.
Add the milk, butter and vanilla essence. Fold in until just combined.
Fold in the flour-coated chocolate chips, if using.
Spoon mixture into prepared tins, until approximately two thirds full.
Bake for 18-20 minutes (regular muffins) or 30 minutes (extra large muffins), until muffins spring back when lightly pressed or a skewer inserted into the centre comes out clean.
Leave to cool in tins for 10 minutes before transferring to a wire cooling rack.
Delicious served warm!