Yes, something like a list of issues that the debate will be about, and then a statement by each candidate about their position on each issue. Then a time when one candidate can address another candidate about their position, and then that candidate has time to respond. Then move on to the next issue on the list. There is only need for a moderator to keep track of time and ensure decorum.
Common sense, right? Just like the candidates on the Right running their own show instead of astonishingly letting the opposition run their show. Common sense - seems to be a rare bird these days.