If you can’t find pepperoncini peppers, you can substitute them with banana peppers, cayenne peppers, jalapeno peppers for a nearly identical taste. Banana peppers are slightly sweeter than pepperoncini, but you can pickle them to create an element of heat. However, cayenne peppers are spicier, and a little goes a long way! Meanwhile, jalapeno peppers create a flavor so similar your taste buds won’t know the difference. Just de-seed them first for a more family-friendly end result.