INGREDIENTS
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2 cups all-purpose flour, sifted
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1 tbsp baking soda
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1 packet sugar substitute
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1 large and very ripe banana, mashed
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8 oz fat-free plain yogurt
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½ cup milk (preferably skim milk)
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½ tbsp canola oil
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1 tsp vanilla extract
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4 egg whites, beaten to soft peaks
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butter-flavored cooking spray