INGREDIENTS
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2 sticks unsalted butter, at room temperature, plus more for the pan
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3 cups plus 2 tablespoons all-purpose flour
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2 1/2 teaspoons baking powder
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1 1/4 teaspoons salt
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1 3/4 cups granulated sugar
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1/4 cup vegetable oil
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4 large eggs, at room temperature
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1 teaspoon vanilla extract
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3/4 cup buttermilk
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2 cups blueberries (about 1 pint)
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2 to 3 cups large strawberries, halved or quartered (about 1 pint)
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1 to 2 tablespoons granulated sugar
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2 1/2 cups confectioners' sugar
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1 tablespoon unsalted butter, at room temperature
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4 to 5 tablespoons milk