Course revision is often challenging, and instructional partnerships between Learning Assistants (LAs; peer mentors) and course instructors can be leveraged to create novel learning spaces, through an ongoing, iterative revision process coupled with an open sharing of ideas between the LA and instructor. We describe the specifics of an instructional partnership between LA and instructor in the context of an online general education course in astronomy and cosmology, focusing both on the partnership and the activities generated through the partnership.