Transgender and/or gender non‐binary (TGNB) individuals face significant health care disparities, including deficiencies in provider knowledge. To address this knowledge gap for genetic counselors, we developed, implemented, and analyzed an educational intervention on gender‐affirming genetic counseling (GC) and care for TGNB patients. In partnership with the TGNB community, we designed a 5‐module (length = 146 min ± 94 min) genetic counseling‐targeted online learning program focused on gender‐affirming care (Amplify). Content included elements of gender‐affirming care, core components of gender‐inclusive GC sessions, and cancer risk assessment/management. Video testimonials featuring TGNB individuals complemented learning within each module. Educational outcomes measured included comfort working with TGNB patients (n = 2 multiple choice questions (MCQs)), impact of education on knowledge (n = 25 MCQs), and clinical self‐efficacy based on the Accreditation Council for Genetic Counseling competencies (n = 35 skills). Participants (n = 40), recruited through state and national GC organizations, completed all modules, and pre‐ and post‐education/self‐efficacy assessments. Pre‐Amplify, 65% (n = 26/40) of participants endorsed feeling ‘somewhat comfortable’ working with TGNB patients. The average knowledge score was 77.6% (SD = 11.2%) with the lowest scores related to the gender affirmation process. After Amplify, overall knowledge improvement was statistically significant with an average 16.9% (p < 0.001) increase in score. Pre‐Amplify, the average self‐efficacy score was 78.4% (SD = 15.8%) with lowest scores seen in statements surrounding information gathering of family and medical histories. Post‐Amplify, overall self‐efficacy improvement was statistically significant with an average 13.8% (p < 0.001) increase in score. Linear regression did not identify an impact of practice specialty on participants’ knowledge gains or self‐efficacy. This study shows online modules are an effective form of gender‐affirming care education for GCs. This intervention can positively improve the care practicing genetic counselors provide to patients and inform future decision‐making about the development of gender‐affirming care education for genetic counselors.