Instructional videos are a popular teaching and learning tool. Teachers use already existing videos and develop their own videos, in which they explain important domain concepts. The effectiveness of these videos depends on their instructional quality. To support future teachers in creating high-quality videos, we developed a training and compared the instructional quality of videos developed by pre-service economics teachers ("N" = 24) before and after the training period. The quality is assessed based on a theoretically funded framework. We identify small improvements regarding the overall instructional quality and provide an overview of the most common changes made by the preservice teachers. Overall, the study contributes to a better understanding of how future teachers can be supported in creating high-quality digital media.