HEALTHY BROWNIES?

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Im looking for a super super healthy brownie recipe! the less sugar the better
I have these ingredients: oat flour, cocoa powder, baking powder, truvia, yogurt, egg whites, peanut butter)
THE LOWER CALORIE AND SUGAR THE BETTER.
I would not like something with butter or flour.
I KNOW IM ASKING FOR A MIRACLE BUT SOMETHING CLOSE WOULD BE NICE :)))

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