University of Minnesota (UMN) Extension has assisted schools in making policy, systems, and environmental (PSE) changes to improve the school food environment. UMN Extension's involvement in the Project breakFAST program demonstrates how Extension can provide training and technical assistance to support school staff in making PSE changes that improve teens' access to school breakfast. Intervention schools increased participation in school breakfast by 56%, whereas comparison schools increased participation by only 7%. Background on and details of the project will be useful to others in Extension interested in assisting schools in implementing PSE changes.