INGREDIENTS
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1/2 cup (8 tablespoons) unsalted butter, room temperature
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1 cup sugar
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2 eggs
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1 teaspoon vanilla
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1 cup sour cream
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3 cups flour
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1/2 teaspoon baking soda
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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3/4 cup (12 tablespoons) unsalted butter, room temperature
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1/4 teaspoon pure vanilla extract
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2 1/2 cups confectioners sugar (see note)
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1/8 teaspoon Kosher salt
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1/4 cup finely chopped fresh strawberries