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Preheat the oven to 325°F.
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Butter and lightly flour a 9x5x3-inch loaf pan, or spray it with a butter-flour spray.
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In a large bowl, on the medium speed of an electric mixer, cream the butter until smooth.
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Add the sugars and beat until fluffy, about 3 minutes.
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Add the egg and beat well, then the buttermilk and vanilla.
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Sift the flour, cocoa, baking soda and salt together right into your wet ingredients.
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Stir together with a spoon until well-blended but do not over mix. Scrape down the batter in the bowl, making sure the ingredients are well blended.
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Pour the batter into the prepared loaf pan. Bake for 60 to 70 minutes, or until a cake tester inserted into the center of the loaf comes out clean.
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Cool in pan on a rack for about 10 to 15 minutes, at which point you can cool it the rest of the way out of the pan.
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Serve with fresh berries.