This mixed methods study explores instructor motivations for offering massive open online courses (MOOCs) as well as the instructional innovations used to enhance the MOOC design. The researchers surveyed 143 MOOC instructors worldwide and then interviewed 12 of these instructors via Zoom. They also extensively reviewed the MOOCs of the interviewees. The primary motivations for offering MOOCs included "growth" needs such as curiosity about MOOCs and the exploration of new ways of teaching. In addition, "relatedness" needs of instructors included reaching more people, showcasing research and teaching, marketing their university, integrating interactive technology, and obtaining peer reviews. The perceived instructional innovations of these MOOC instructors included using problem-based learning, service learning in MOOCs, and shortening the length of videos. Overall, these MOOC instructors were satisfied with their MOOC designs.