This research aimed to investigate effective approaches to teacher development as a meaningful form of professional development (PD). The objective was to assess the impact of teachers' learning as an approach to PD and to summarize best practices. The study involved teachers from two primary schools who participated in the Healthy School Empowerment Project, a four-year collaborative learning initiative designed to support educators in improving classroom instruction and enhancing school performance. The findings revealed the most effective approaches for professional development and enhancing teachers' learning include establishing the school as a professional learning community (PLC), implementing teacher-as-learner programs, providing coaching by master teachers, and fostering teacher networks.