INGREDIENTS
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2 cups all-purpose flour
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1/2 cup dutch-process cocoa powder
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1/2 teaspoon baking powder
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1/4 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup granulated sugar
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1/2 cup lightly packed light brown sugar
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9 tablespoons unsalted butter, room temperature
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2 tablespoons sour cream
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1 large egg
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1 large egg yolk
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1/2 tablespoon vanilla extract
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8 ounces strawberries, hulled and cut in half
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16 tablespoons (2 sticks) unsalted butter, room temperature
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3 cups confectioners’ sugar, sifted
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1/4 teaspoon salt
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1 teaspoon vanilla extract