INGREDIENTS
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3 cups unbleached pastry flour, plus extra for flouring the pan
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1/4 teaspoon baking soda
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1/2 teaspoon salt
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1 cup (2 sticks) butter, softened
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2 1/2 cups sugar
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6 large eggs (or 5 extra-large eggs)
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2 teaspoons of vanilla extract
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1 cup (8 ounces) sour cream