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Heat the oven to 180°C. Line a standard-sized (23 x 13cm) loaf tin with baking paper.
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In a large bowl, cream the butter and sugar together until light and fluffy. Beat the eggs into the butter and sugar one at a time until fully incorporated.
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Fold the vanilla extract, mashed bananas and roughly chopped chocolate into the butter and sugar mixture.
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Sift the flour and baking powder over the top and gently fold it in until just combined.
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Scrape the batter into the lined loaf tin and bake for 40-50 minutes until a skewer inserted into the center comes out just clean ( a bit of chocolate is fine). If it starts to get too dark before it is cooked, cover it with a piece of tin foil.
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Remove from the oven and leave to cool for 15 minutes. Then, using the baking paper as a sling, remove the banana loaf from the tin.