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Preheat oven to 350 degrees F.
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Grease and flour 2 round cake pans (8 inch are best, but you can use 9. Also, I prefer to use non-stick springform pans for easy removal).
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Combine cake mix, water, lime juice, butter and eggs and mix at low speed until all is moistened (scraping sides of bowl).
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Beat for 2 minutes on high speed (as per cake mix instructions).
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Gently fold the sour cream into the batter.
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Divide batter evenly between two pans and bake for 30-35 minutes, or until cakes are set and golden brown.
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Cool on wire rack approximately 10-15 minutes, then remove from pans and cool completely.