King Arthur Flour's Favorite Fudge Cake
This old-fashioned chocolate sheet cake is incredibly moist, and can be stirred together by hand if need be. The fudge frosting is also stir-together simple, and creates a lovely thick layer on top. You can line the pan with parchment or foil before baking, grease it, and lift the cake out of the pan once it's cool before frosting. This makes cutting the cake easier to do, and individual portions nestle nicely into muffin papers. It's sure to be a hit at your next potluck.