Sour cream can be used in place of
buttermilk in this recipe.
You can sub in 1 tablespoon of Dutch-
process cocoa powder for 1 tablespoon
of the unsweetened cocoa powder, if I
have some on hand, for a deeper
chocolate flavor in the cake and frosting.
You can store any leftover cake in an
air-tight container for up to 3 days, either
at room temperature, or in the fridge.