Just like in any recipe, if you substitute one type of ingredient for a different type, you’ll get a different taste, a different texture, or both! In some cases you can get away with using salted butter or unsalted butter interchangeably because you can reduce or add the amount of salt in the recipe. However, this recipe doesn’t call for any salt. So if you use salted butter, you’ll be adding an ingredient that isn’t called for. Keep that in mind if you decide to use salted butter versus unsalted butter.