During mirror meetings, professionals were confronted with the experiences of young people (YP) with inflammatory bowel disease to encourage them to improve their transitional care arrangements. The mirror meetings were held under guidance of an independent moderator. YP conversed about their transition experiences, while health care providers listened without interfering. Meetings were audio-recorded and summarized. Qualitative thematic analysis was conducted. Thirty-two YP participated in six mirror meetings with 26 professionals from paediatric and adult care. Professionals received concrete suggestions for improving their transitional care arrangements. These were about holistic care, tailored to individual needs and preferences, attention for mental health and the role of parents and peers. Advice given by YP matched transitional care guidelines' recommendations. Mirror meetings are a powerful tool to enhance professionals' awareness of YP's needs.