Beat boxed cake mix, margarita mixer, oil, 1 tablespoon lime peel and egg whites with electric mixer on low speed 30 seconds. Beat on medium speed 2 minutes, scraping bowl occasionally. Pour batter over pretzel mixture.
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Bake 35 to 40 minutes at 350F or until light golden brown and top springs back when touched lightly in center. Cool completely, about 2 hours. Frost with whipped topping; sprinkle with additional lime peel.
I like to use the lime coolwhip, or if I'm serving immediately, to mix a little lime juice in the topping.
CAUTION- lime juice will curdle the whipped topping. So be aware of your timing.
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