Buttermilk is needed for this recipe and can’t be replaced with regular milk. If you don’t have buttermilk at home read through the FAQ section below on how to make your own. This chocolate buttercream recipe is pure heaven. It is seriously SO good that you’ll be eating it with a spoon. I’ve made chocolate Swiss meringue buttercream in the past, but have always struggled a bit getting it to look and taste very chocolatey. With American chocolate buttercream, it’s easier to achieve that fudgy flavor and color.