1.Preheat oven to 200°C/400°F. Grease a 12-hole (⅓ cup/80ml) muffin pan.
2.Heat oil in a medium frying pan; cook onion, stirring for 5 minutes or until onion softens. Add spinach; cook, stirring, for 1 minute or until wilted. Cool.
3.Sift flour into a large bowl; stir in combined butter, egg and buttermilk. Add cheeses and spinach mixture to flour mixture; mix gently to combine. Do not over-mix; mixture should be lumpy. Spoon mixture into pan holes.
4.Bake muffins for 20 minutes or until a skewer inserted into the centre comes out clean. Leave muffins in pan for 5 minutes before turning, top-side up, onto a wire rack. Serve warm.
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