In this paper we report our experiences from a University outreach program with primary and secondary education teachers of various specialties. Our goal was to improve the coding abilities of teachers through Scratch activities. The participants can in turn teach their students, multiplying that way the benefitted population. To increase the participation and the completion percentage, the activities are designed as a course in Moodle realized in discrete runs with manageable groups, in a blended learning approach. The educational material was a combination of learning objects with specific objectives, video material and try-out activities. The course has been completed by 559 teachers from various Greek districts, mainly of regional areas, with a high completion rate of 65%. The participants found the experience highly satisfying, interesting and agreed that they had been supported effectively throughout the process. In the paper we describe the rational of our approach, the design and implementation phases of the project, the outcomes and the main findings of the evaluation of the user opinions.