A fluffy and moist cake with the best easy vanilla frosting! All you need is one bowl and a whisk to make it!
Add egg, buttermilk, vanilla and oil. Whisk together. Add hot water and whisk well until the batter is smooth. It will be runny but that's okay.
To make homemade buttermilk: mix 2 teaspoons apple cider vinegar with enough half and half to make 1/2 cup of liquid. Let stand for 3 to 4 minutes. When the mixture looks thick and curdled, use in the recipe.
Use good quality vanilla as that is the primary flavor in this cake.
For the best frosting: make sure the butter is soft. Otherwise, the frosting won't be fluffy.