Using a Design Thinking (DT) approach, the ChallenGE Project in South Australia (SA) was an innovative professional learning (PL) program that was developed, implemented, and researched by three Senior Educational Consultants from the Association of Independent Schools of South Australia (AISSA) and one academic from Flinders University over three years. The aim was to support participating schools (n = 27) to improve outcomes for their highly able learners (HALs). The ChallenGE Design-Based Research (DBR) project developed principles and a framework for contextualised PL in gifted education through an inductive qualitative manual coding analysis of participants' self-reported learning. This paper, applying the format for reporting DBR studies recommended by Jen et al. (2015) explains the goals and elements of the innovation, the setting within which it was implemented, a description of each phase, the outcomes, and the lessons learned. This research study contributes to an expanded view of effective PL in gifted education using insights gained from a DT approach.