INGREDIENTS
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For Cupcakes
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1 1/2 cups unbleached all-purpose flour (7 1/2 ounces)
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1 cup granulated sugar (7 ounces)
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1 1/2 teaspoons baking powder
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1/2 teaspoon table salt
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8 tablespoons unsalted butter (1 stick), room temperature
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1/2 cup sour cream
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1 large egg, room temperature
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2 large egg yolks, room temperature
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1 1/2 teaspoons vanilla extract
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For Frosting
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1 cup heavy cream
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8 ounces semisweet chocolate, chopped