INGREDIENTS
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1 lime
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1/2 cup butter, softened
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1/2 cup granulated sugar
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1/2 teaspoon baking powder
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1/8 teaspoon salt
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1 egg
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1 tablespoon lime juice
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1 1/2 teaspoons vanilla
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1 1/2 cups all-purpose flour
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1 1/2 cups powdered sugar
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1 tablespoons lime juice
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Finely shredded lime peel (optional)