INGREDIENTS
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1/2 cup unsalted butter, room temperature, plus more for the pan
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1 cup sugar
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1 3/4 cups flour
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1 1/2 teaspoons baking powder
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1/2 teaspoon salt
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3 large eggs
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1 1/2 teaspoons vanilla
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2/3 cup buttermilk
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1/3 cup cocoa powder
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2/3 cup of heavy cream
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6 ounces dark chocolate, chopped
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1 tablespoon corn syrup (optional)