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Preheat oven to 375 degrees. Grease a 9x13 pan and set it aside
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Using a hand or stand mixer, beat the butter, sugar and add 2 tbsp cocoa powder.
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Once combined, add one egg until thoroughly mixed.
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Add another 2 tbsp of cocoa powder, mix well.
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Add another egg until thorough mixed
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Add the final 2 tbsp of cocoa powder.
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Slowly pour in the orange juice.
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Add flour, about 1/4 cup at a time, stopping occasionally to scrape down the sides.
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Add the vanilla, baking soda, and buttermilk. Mix well and scrape down the sides.
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Bake for about 25 minutes or until done.
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When brownie-cake is done, allow to cool on a wire rack, once cool, frost.