I thought you said something that pairs with stouts…
None of the brownie recipes I use have liquid that could be substituted by beer, but here’s one from epicurious.
Or make your chocolate stout cake recipe in a regular cake pan (or two, layer with ganache) instead of a bundt, since you’re already comfortable with the recipe itself.
I’d just be careful about too-sweet things that might kill the flavor of the accompanying beer.
