INGREDIENTS
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Vegetable oil cooking spray, for pan
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3/4 cup all-purpose flour, plus more for surface
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1/4 cup unsweetened cocoa powder
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1/3 cup unsalted shelled pistachios, chopped
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Salt
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1 stick unsalted butter, room temperature
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1/4 cup sugar
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1/2 teaspoon pure vanilla extract
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1/2 cup unsalted shelled pistachios
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1/4 cup sugar
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Salt
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1 teaspoon safflower oil
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5 ounces milk chocolate, chopped
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1/2 cup heavy cream
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1/4 cup whole milk
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1 large egg, beaten
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Garnish: finely chopped pistachios (optional)