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Preheat your oven to 350°F (175°C). Grease a 9x5 inch loaf pan or line it with parchment paper.
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In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
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In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.
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Beat in the eggs, one at a time, until well incorporated.
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Mix in the mashed bananas, plain yogurt or sour cream, and vanilla extract until smooth.
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Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
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Gently fold in the chopped walnuts and chocolate chips or chunks until evenly distributed throughout the batter.
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Pour the batter into the prepared loaf pan and spread it out evenly.
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Bake in the preheated oven for 55-65 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.
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Once baked, remove the banana bread from the oven and allow it to cool in the pan for about 10 minutes.
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After 10 minutes, carefully remove the bread from the pan and transfer it to a wire rack to cool completely before slicing.
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Once cooled, slice the Chocolate Walnut Banana Bread and serve. Enjoy it with a glass of milk or a cup of coffee for a delightful treat!