INGREDIENTS
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1/2 cup sugar
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1 large egg
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2 cups 1% low-fat milk
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1/3 cup unsweetened cocoa
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1 tablespoon cornstarch
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1 tablespoon instant espresso granules
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1/8 teaspoon salt
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1 ounce bittersweet chocolate
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1 teaspoon unsalted butter
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1 teaspoon vanilla extract