What if I can’t find buttermilk at the store?
You can make your own buttermilk by adding ½ tbsp of apple cider or white vinegar in a measuring cup and adding enough room temperature milk to get a total of half a cup. Stir and let sit for 5 minutes. It should become lumpy and thick. Use soy or almond milk for a non-dairy option. Plain kefir also works as a good replacement for buttermilk.