| • | Coat a baking cooking pan with cooking spray.
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| • | Heat oven to 350 degree Fahrenheit.
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| • | Sieve the flour and mix it with cocoa and baking powder in a little bowl.
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| • | Stir prune puree, brownish sugar, sugar and oil in an some other normal bowl.
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| • | Add vanilla take aside and egg whites, beat well until fluffy.
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| • | Add the above mixture to the cocoa-flour-baking powder mixture. Blend gently.
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| • | Transfer the whole mixture into the lubricated baking cooking pan and bake for about 20 minutes.
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| • | Sprinkle with sugar and allow cooling.
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| • | Cut into bars and serve.
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