This work presents the design and development process of an immersive experience applying a co-creation approach between humans and generative artificial intelligence tools. From the point of view of any user, Coffee Masterclass is an immersive experience that brings anyone to the art and pleasure of preparing specialty coffees. However, the Coffee Masterclass is the result of the inclusion of prompt engineering outputs in each stage of the building process. The co-creation approach is included in all development processes, i.e., from the narrative to the visual content generated through code writing, which has been co-created between the creative team and GenAI. This work tells details of this approach, including how the generative artificial intelligence tools were used in each stage of immersive experience development. This work shows the advantage of involvement in a development team of people with skills in prompt engineering and interaction with Large Language Models. Also, it includes recommendations to other development teams, including generative artificial intelligence tools by future developments.