Method

1. Preheat the oven to 180°C / 350°F / Gas mark 4
2. Beat the egg and add to the margarine and sugar in a large mixing bowl
3. Sift in the flour
4. Whisk the mixture quickly
5. In a separate bowl, mash the bananas with a fork
6. Add the bananas and the walnuts and mix again
7. Put the dough into a loaf tin and smooth off the top
8. Bake the loaf in the middle of the oven for just under an hour
9. You’ll know the bread is ready when the loaf rises and when a skewer or knife put into the loaf comes out clean