"In step 5, the cooled frosting stays soft and spreadable longer than other recipes, but it will harden over time. If the frosting does begin to stiffen, you can microwave it for about 10 seconds (or until it returns to a spreadable consistency)...."
INGREDIENTS
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CAKE:
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1/2 cup buttermilk, room temperature
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4 large eggs, room temperature
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2 teaspoons vanilla extract
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2 1/4 cups all-purpose flour
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1 1/2 cups granulated sugar
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1 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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3/4 teaspoon salt
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16 tablespoons (2 sticks) unsalted butter, cut into 16 pieces and softened
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FROSTING:
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12 tablespoons (1½ sticks) unsalted butter, cut into 12 pieces and softened