"This white cake recipe is buttery and moist with the softest crumb. The tricks are to use cake flour, egg whites, and sour cream...."
INGREDIENTS
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2 and 1/2 cups (250g) sifted cake flour* (spoon & leveled)
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2 teaspoons baking powder
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1/2 teaspoon baking soda
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1 teaspoon salt
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3/4 cup (1.5 sticks; 170g) unsalted butter, softened to room temperature
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1 and 3/4 cups (350g) granulated sugar
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5 large egg whites, at room temperature
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1/2 cup (120g) sour cream, at room temperature*
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1 Tablespoon pure vanilla extract (yes, Tbsp!)
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1 cup (240ml) whole milk, at room temperature*
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1 and 1/4 cups (2.5 sticks; 287g) unsalted butter, softened to room temperature
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5 cups (600g) confectioners' sugar
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1/3 cup (80ml) heavy cream
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2 teaspoons pure vanilla extract (or use clear imitation vanilla extract for stark white frosting)
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1/8 teaspoon salt
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sprinkles for garnish