INGREDIENTS
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For the cake:
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2 cups all-purpose flour
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup (1 stick) unsalted butter, softened
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1 1/4 cups granulated sugar
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3 large eggs
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2 teaspoons vanilla extract
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1 cup sour cream
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3/4 cup chopped pistachios, plus more for garnish
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For the frosting:
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1/2 cup (1 stick) unsalted butter, softened
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6 ounces white chocolate, melted and slightly cooled
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1/2 cup confectioners’ sugar
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1/2 teaspoon vanilla extract