INGREDIENTS
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Yield: Two 6-inch round cakes or one 9-by-12-inch sheet cake
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Level: Intermediate
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Cake:
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1 stick (4 ounces) unsalted butter, at room temperature, plus more for the pan
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1 1/4 cups cake flour
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3/4 cup all-purpose flour
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1 1/2 teaspoons baking powder
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1 teaspoon salt
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2 cups sugar
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1/3 cup vegetable oil
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4 egg yolks, at room temperature (when separating the eggs, set aside 2 of the whites to use below)
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3 whole eggs, at room temperature
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1 tablespoon vanilla extract
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1/2 cup buttermilk
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2 egg whites, at room temperature
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Brown Butter Icing:
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3 sticks (12 ounces) unsalted butter
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1 1/2 pounds (about 5 cups) powdered sugar, sifted, plus more if needed
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1 tablespoon vanilla extract
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Pinch salt
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Heavy cream or milk, for thinning, if needed
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2 pints blueberries
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2 pints raspberries