Serve this cake warm for the ultimate in gooey chocolate! The frosting will settle to the bottom of the slow-cooker, simply spoon it over your warm cake. And, of course, top with ice cream for the ultimate in a chocolate dessert!
To replace the Stout in the cake you can substitute 2% milk. To replace the Stout in the frosting you can remove it and change the water amount from ½ cup to 1 ½ cups.