Preheat the oven to 180°C (350°F/Gas 4). Sift the flour and baking powder together into a mixing bowl and rub in the butter until the mixture resembles fine breadcrumbs. Stir in the sugar.
Mash the bananas with a fork, then add to the flour with the yogurt, eggs, and walnuts. Beat with a wooden spoon until well combined. Spoon into a greased and lined loaf tin, level the top, then make a slight dip in the centre.
Bake for 1–11/4 hours, or until a skewer inserted into the centre comes out clean. Leave to cool in the tin for 5 minutes, then turn out on to a wire rack to cool completely.
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