"Zoom class" has become a prevailing norm for online synchronous learning during the COVID-19 pandemic. However, Zoom classes are often associated with fatigue and lack of student engagement. Theories of computer-mediated communication suggest that text-based, low-bandwidth, online communication may yield more positive communication outcomes than face-toface and high-bandwidth channels. This paper introduces an innovative teaching method that uses Slack--a text-based, persistent-chat platform in online synchronous classes. Courses: Instructors can implement this learning method into a wide variety of courses that benefit from in-class discussions and student participation. Objectives: This teaching practice will help improve students' engagement and buy-in in synchronous online classes.