INGREDIENTS
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1 3/4 (224 g) cups cake flour
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1 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1/4 cup (57 g or 1/2 stick) unsalted butter, room temperature
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1 cup (200 g ) granulated sugar
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2 large eggs
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1/3 cup (75 g) sour cream (or plain, low-fat yogurt)
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1/4 cup (60 ml) vegetable oil
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2 tablespoons vanilla extract
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2/3 (160 ml) cup milk
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1 cup (2 sticks) unsalted butter
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2 1/2 cups (300 g) powdered sugar, sifted
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2 teaspoons vanilla extract
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1/8 teaspoon salt
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1-2 tablespoons milk