This is the perfect chocolate layer cake for two people and provides for desert after two meals. We bake the cake in a Fat Daddio's anodized aluminum square pan with removable bottom, 4" by 4" by 3". The removable bottom is not a requirement but it does make releasing the cake from the pan quite easy. The cake rises almost to the top of the pan when baked.
Because the amount of batter made is quite small it is easier to whisk the ingredients by hand then it is to use an electric stand mixer. We used a stand mixer the first time we made this cake and found that the ingredients weren't combining as the machine's whisk barely touched the ingredients on the bottom of the mixer bowl.
We used a hand mixer for the frosting, which was perfect for the quantity involved.