Preheat oven to 180 C (350 F) standard / 160 C (320 F) fan-forced. Grease six holes of a 6 or 12-hole muffin pan well with butter or spray lightly with oil.
In a large mixing bowl, add flour, baking powder, baking soda, cocoa powder, salt and brown sugar and whisk gently.
In a separate mixing bowl, add oil, vanilla, egg and milk. Whisk with a fork just to break up the egg yolk. Add to dry ingredients and gently fold to combine. Stir through chocolate chips. Try not to over mix.
Divide chocolate muffin batter into 6 muffin holes – it’s ok to fill them right to the top (see photo below). Bake for 18-20 minutes or until muffins have risen and domed or a skewer inserted into the centre comes out clean.
