You could play around with the recipe below omitting the orange zest & orange liqueur & use blackberry.

Here is a link that might be useful: Layered Bar Cookie

I think I would just make a chocolate brownie...and bake it a bit longer than the chewey/gooey stage....then poke it all over with a skewer and drizzle about 2 T of blackberry liquor over it, cover the pan with plastic and let it sit for several hours....and serve with whipped cream and a couple of black berries or raspberries.
Linda C

Thanks, Ginger and Linda! Those both look great. I may just try the Grand Marnier, too!
chery2

You're welcome!