This case study explores an innovative approach to integrating generative artificial intelligence (GenAI) into higher education learning and teaching. Students collaborate on an open wiki platform to create unique written works on applied motivation and emotion topics as part of their assessment. Each edit is summarised, detailing GenAI tool usage and prompts, promoting transparency about information sources. Students are required to fact-check GenAI content, revise wording, and support their work with well-selected citations from peer-reviewed sources. This approach develops the knowledge and skills needed for responsible GenAI use, fostering academic integrity. The open writing format allows for feedback from peers and teachers, creating an immersive learning experience. This initiative has collaboratively produced over 1,500 online open educational resources, demonstrating a scalable model for authentic written assessment in the digital age.