INGREDIENTS
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1 (18.25 ounce) package white cake mix
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3 egg whites
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1 (10 fluid ounce) can frozen margarita mix (such as Bacardi®), thawed
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2 tablespoons vegetable oil
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1 tablespoon grated lime peel
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1 tablespoon lime juice
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1 (8 ounce) package cream cheese, softened
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1/2 cup unsalted butter, softened
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1 tablespoon grated lemon peel
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1 tablespoon lime juice
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5 cups confectioners' sugar