This study explores the benefit of using performance art to promote self-determination in adolescents with intellectual and developmental disabilities (IDD). Using self-determination theory, adolescents with IDD engaged in a 10-week technical theatre workshop. Typically-developing peer mentors were trained on the Cognitive Orientation to daily Occupational Performance (CO-OP) approach and associated metacognitive strategies to assist participants throughout the program. Results of this study indicated that adolescents with IDD can increase their self-determination by engaging in meaningful extracurricular occupations that support their social, cognitive and physical needs.