To make the cake, you want your customary cake stuff. The dry components are flour, sugar, cocoa powder, baking powder, baking soda, and salt, whereas the moist ones are eggs, buttermilk, vegetable oil, vanilla, and low. For the frosting, you will additionally want butter, powdered sugar, and whipping cream.
There are a few straightforward swaps you can also make if you do not have the entire components available. For one factor, it is super-easy to DIY your personal buttermilk by including a tablespoon of lemon juice or plain white vinegar to common milk. For an additional, you need not open a carton of whipping cream for the few tablespoons wanted on this frosting as Morone tells us "You can use half and half or milk within the frosting, as a substitute." In reality, one profit of constructing this change is that you're going to get to make use of rather less (strive perhaps 2-3 tablespoons to begin) as a result of each of those choices are thinner than heavy cream.