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Pre heat oven to 350°F.
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Spray bottom of 9×13 pan with non-stick cooking spray.
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In large bowl, beat cake mix, water, oil and egg whites with electric mixer until combined. Pour cake mixture into baking pan and cook for length on package (probably about 25-30 minutes) or until toothpick inserted in center comes out clean.
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Remove cake from oven and let cool in baking dish.
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Boil 1 cup of water and mix gelatin package in water until dissolved. Add ½ cup cold water.
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Using tongs of a fork, poke holes in cake, about every ½ inch.
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Pour dissolved lime gelatin over top of cake. Let cool completely, about 1 hour.
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Spread whipped topping over top of cake. Sprinkle with green jimmies.
