Preheat the oven at 180°C and grease the moulds or place the paper liners in the muffin tray

Put orange quarters in food processor (or blender) along with orange juice and process or blend until pureed.

Add egg and butter to food processor and combine; pour into large bowl.

Combine dry ingredients together in a separate bowl,then add all to orange mixture. Mix well

Fill muffin cups about 3/4 full.

Bake in preheated oven for 20 minutes; remove from oven and let stand in tin for 5 minutes before removing muffins.