| • | Coat a baking pan with cooking spray.
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| • | Heat oven to 350 degree Fahrenheit.
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| • | Sieve the flour and combine it with cocoa and baking powder in a small bowl.
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| • | Stir prune puree, brown sugar, sugar and oil in an another medium bowl.
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| • | Add vanilla extract 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 greased baking 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. |
