Don't even have to do that. I've been tossing the idea around of just hiring some grad student or college instructor to develop the course for me. Invest several hundred to a couple thousand.
This was a pretty good video. Creating and selling online courses does seem like one of the better ways for "passive" income... just gotta find something your knowledgeable about, or some principles you're well-versed on, and then apply them to common or niche problems that need "solving".