When I was a teenager, my good friend's mother used to make the best brownie cookies. I think they were unbaked

and contained rolled oats and raisins. They were really chocolatey and light, and more like candy than cake. She made them separate like cookies, rather than cut out from a sheet like regular brownies.
She told me that she had gotten the recipe in Germany. Unfortunately, I never thought to get the recipe from her, and have now lost touch with the family.
I would love to make these fudge brownies, but have no idea how they're made or even what they're called. Is anyone familiar with these brownies? If so, would you please share the recipe?
Thanks.