Banana Muffins

200g (7 oz) plain flour 1/2 teaspoon baking powder 1 teaspoon bicarbonate of soda 1/2 teaspoon salt 3 large bananas, mashed 150g (5 oz) caster sugar 1 egg 75g (2 1/2 oz) butter, melted Preheat the oven to 180 C / Gas 4. Place 12 paper baking cases in a muffin tin. Sift together the…