Another mistake is skipping the buttermilk. If you don’t have it on hand, you might be tempted to replace it with regular milk. But buttermilk is crucial for that tangy flavor and moisture that makes this cake so special. If needed, you can create a substitute mix by adding a tablespoon of vinegar or lemon juice to a cup of regular milk—let it sit for about five minutes before using.
Finally, don’t forget the vinegar and baking soda reaction! It’s a common error to mix them too soon or too late. You want to add them just before you put the batter in the oven to help the cake rise beautifully.