200 g (7 oz) plain flour
140 g (5 oz) caster sugar
1 1/4 teaspoons baking powder
1/2 teaspoon bicarbonate of soda
1/2 teaspoon ground cinnamon
2 egg whites
3 bananas, mashed
4 tablespoons apple purée or sauce
1. Preheat oven to 180 C / Gas mark 4. Lightly grease a 20x10cm (8x4 in) loaf tin.
2. In a large bowl, stir together flour, sugar, baking powder, bicarbonate of soda and cinnamon. 3. Add egg whites, bananas and apple purée; stir just until combined. Pour batter into prepared tin.
4. Bake in preheated oven for 50 to 55 minutes, until a skewer inserted into centre of loaf comes out clean. Turn out onto wire rack and allow to cool before slicing.
5. Tip. If your bananas are already black but you can't make a cake right away, simply pop them in the freezer. Defrost the bananas whenever you're ready to bake!