In recent years, advances in information technology (IT) and the Internet have transformed the educational field. These advances have created new opportunities for learning and collaborative interaction in producing digital educational resources (DERs). Students and educators alike recognize this opportunity and are harnessing the potential of models, methods, technologies, and approaches derived from generative artificial intelligence (GenAI). This article explores the interaction and co-creation among the various stakeholders in designing and developing educational resources. We present a methodology based on microlearning principles to guide the co-creation of DERs with GenAI. This methodology employs a Participatory Action Research approach, emphasizing three phases: Exploratory ‘High school workshops’; Formative ‘University student workshops’; and Initial validation of the resource co-creation process. The knowledge base is improved through the input obtained in each phase, enhancing participation and providing a comprehensive understanding of the co-creation process.