INGREDIENTS
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1 1/4 cups granulated sugar
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1/4 cup cornstarch
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1/2 teaspoon salt
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2 cups half-and-half
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1 cup milk
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6 ounces unsweetened chocolate, chopped
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2 teaspoons vanilla extract
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1 1/2 cups flour
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2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1 stick (8 tablespoons) unsalted butter
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3/4 cup cocoa powder (preferably Dutch-processed)
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1 cup water
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1 cup buttermilk
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1 cup packed light brown sugar
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1 cup granulated sugar
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2 large eggs
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1 teaspoon vanilla extract