• prep: 15 min
• cook: 12 min
• total: 27 min

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

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