Virtual Exchanges (VEs) are flourishing yet there are still few courses in higher education that offer in-service teachers the fundamental theoretical and practical knowledge necessary to organize and conduct a telecollaborative project in their own educational settings. This paper aims to provide a resource to teacher educators and course designers who seek to design a course on VEs in higher or post-secondary education. Through reflective practice (Bolton, 2018) and adhering to the principles of educational design research (McKenney & Reeves, 2012), the process of design and development of an online master's course for language teachers is described. The article begins by describing the context and discussing the underlying rationale and principal course aims and learning outcomes, and the syllabus and assessment tasks are then reviewed. Course evaluation throughout the years is briefly reported as well as other outcomes. The results are positive overall both in terms of how students evaluated the course and the competences they acquired, although a couple of limitations are recognized. The study concludes with a reflection on the process of course design and the challenges faced. [For the complete volume, see ED609298.]