INGREDIENTS
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softened butter, for the pan
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1/2 C (1 stick) unsalted butter
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1/4 C unsweetened baking cocoa powder
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1/2 C vegetable oil
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2 C all-purpose flour
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1 tsp baking soda
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1/2 tsp salt
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2 C granulated sugar
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2 large eggs
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1/4 C buttermilk
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1/4 tsp vanilla extract
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1/2 C (1 stick) unsalted butter
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1/2 C buttermilk
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1/4 C unsweetened baking cocoa powder
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1 (1-pound) box powdered sugar (4 3/4 cups)
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1 tsp vanilla extract
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pinch of salt