INGREDIENTS
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1 3/4 cups all-purpose flour
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1 1/2 teaspoons baking powder
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1/4 teaspoon salt
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1/2 cup sour cream
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1/2 cup milk
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2 large egg whites, at room temperature
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1 stick (4 oz) unsalted butter, melted
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1 cup granulated sugar
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1 tablespoon fresh lemon juice
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zest of one lemon (about 2 teaspoons)
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Lemon Buttercream Frosting:
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2 sticks unsalted butter (very soft)
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4 cups confectioners sugar
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1 teaspoon lemon juice
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1 teaspoon lemon zest
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2 tablespoons heavy cream