*Note: If you don't have buttermilk, don't worry! You can make it. Put 1½ T (4½ tsp) white vinegar or lemon juice in a glass measuring cup that holds at least 2 cups. Add milk (preferably whole/full fat) until you reach the 1½ cup mark. Let it sit for about 10 minutes and it will start to curdle and be ready to use.