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Heat the oven to 180C/160C fan/gas 4. Butter a 900g loaf tin and line the base and sides with baking parchment. Beat the softened butter and sugar together using an electric whisk until light and fluffy. Combine the egg and vanilla extract and pour this in, a little at at time, mixing between each addition. Fold in the flour, a pinch of salt, the baking powder, mashed banana and all but a handful of the chocolate chips.
Scrape the mixture into the prepared tin and scatter over the rest of the chocolate chips. Bake for about 50 mins, or until puffed up and cooked through – a skewer inserted into the middle of the loaf should come out clean. Leave to cool in the tin for 10 mins, then remove to a wire rack and leave to cool completely. Slice before serving. Will keep in an airtight container for up to five days.
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