The teaching of Bosnian, Croatian, Montenegrin and Serbian (BCMS) presents particular methodological challenges for the lecturers at the Slavic departments. As part of a teaching project at the University of Zurich, we developed identical online teaching materials (in “Pressbooks” e-format) for each BCMS standard language in the language courses, which correspond to CEFR levels A1 to approximately B1+ / B2. Using selected examples, this text demonstrates how classes can be conducted simultaneously in each language using carefully adapted texts, exercises, and grammar materials, accompanied by authentic audio recordings. In the text we include a link to a freely accessible Pressbook that contains selected sample materials. With these teaching tools, we challenge the common assumption that “nobody can speak all BCMS languages”. We show that a well-coordinated BCMS team consisting of native-speaking staff and heritage-speaking students, who work together to create the teaching materials, can eliminate this problem. An important aim of the project was to highlight how heritage language skills in BCMS are both personally and socially enriching. In the text, we demonstrate the many ways heritage speakers can contribute to the creation of teaching materials. We present a concept of BCMS language teaching that mirrors the reality among BCMS speakers: each speaker communicates in their own BCMS language mostly effortlessly with speakers of the other BCMS languages. In this way – through separate learning materials but shared communication – students develop the ability to manage both active and passive language skills and to identify distinctive features across the different standards.