Project-Based Learning (PBL) is positioned as a pedagogical approach to support authentic, discipline-rich STEM curricula. However, much of the research has focused on the effectiveness of researcher-created curricula rather than teacher-created curricula. In this manuscript, we seek to illuminate the ways in which teachers create discipline-rich STEM projects. Drawing on the theory of the curriculum enactment process, we analyzed curricular artifacts from our teaching practices that we created as secondary STEM teachers who designed and enacted project-based learning. From the analysis, we propose a framework grounded in disciplinary standards to support teachers in creating discipline-rich STEM projects by attending to (1) the Elements of PBL; (2) Content Storyline; (3) Practice Pathway.