The number of online courses, programs, and schools are growing exponentially in K-12 education. Given the unique nature of online courses and the distinct skills necessary to create a quality online course, it is essential that effective professional development be provided for teachers designing online courses. Online courses need to be of the same quality as their face-to-face counterparts. Thus, K-12 teachers must learn how to design an online course to meet recognized standards of quality. The current study explored the effects of a professional development model designed to provide an authentic, project- and standards-based experience to K-12 educators. The extent to which teachers designed an online module to meet Quality Matters standards was assessed. Overall, the majority of participants (n = 97) were able to successfully transfer learning to design and develop an online course to meet standards. Areas of concern regarding specific standards are discussed. Recommendations for more rigorous research are suggested to determine the degree to which outcomes are specifically related to the course experience as opposed to outside variables such as learner and instructor characteristics. Results of this study can be used to inform design of effective professional development for online course design.