INGREDIENTS
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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 softened
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Frosting
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12 Tb butter, cut into 12 pieces, softened
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2 cups dark brown sugar
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1/2 ts salt
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1/2 cup heavy cream
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1 ts vanilla
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2 1/2 cups powdered sugar, sifted