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Preheat oven to 350°F (175°C). Grease a loaf pan.
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In a bowl, whisk together flour, cocoa powder, baking soda, and salt.
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In another bowl, cream butter and sugar until light and fluffy.
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Add eggs one at a time, beating well after each. Stir in vanilla.
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Gradually add the dry mixture, alternating with buttermilk, until smooth.
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Fold in chocolate chips if using.
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Pour batter into the loaf pan and spread evenly.
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Bake for 45–55 minutes, or until a toothpick comes out clean.
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Let cool before slicing.
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