INGREDIENTS
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1 (16.5-ounce) package white or yellow cake mix
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1/4 cup egg substitute
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1 teaspoon coconut extract
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1 (12-ounce) can diet lemon-lime soda
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1 cup fat-free sour cream
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1 cup flaked coconut, with 1 tablespoon reserved for garnish
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1 (8-ounce) container fat-free frozen whipped topping, thawed