"In' All Cakes Considered' by Melissa Gray..."
INGREDIENTS
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1/2 cup unsalted butter, at room temperature
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1 cup sugar
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2 large eggs
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1 3/4 cups all-purpose flour
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2 teaspoons baking powder
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1/2 teaspoon salt
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2/3 cup heavy whipping cream
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1 key lime
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1/2 cup fresh key lime juice
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1 cup powdered sugar, plus
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1 tablespoon powdered sugar, for dusting