The article deals with the problem of professional development of teachers and lecturers in Ukraine in today's challenging conditions. The authors of the article are representatives of the development team of the online course "Content and Language Integrated Learning (CLIL) Methodology" for educators. It is a product of the collective creativity of the Foreign Language Teacher Training Capacity Development as a Way to Ukraine’s Multilingual Education and European Integration (MultiEd) project team, сo-working under the umbrella of the Erasmus+KA2 programme. The course is hosted on the Moodle platform of Zaporizhzhia National University; it is aimed at training specialists capable of adapting and implementing advanced teaching methods in the educational process of the New Ukrainian School. This course is designed for subject teachers, foreign language teachers in secondary and higher education, as well as educational institution leaders who understand the contemporary challenges of education in line with the demands of the job market and are interested in modernizing existing educational programs, improving teaching and learning methods, and implementing a culture of quality assurance in education. The course is developed in the Ukrainian and English languages; it is flexible in time and choosing subject themes to fill the gaps in knowledge. The article presents the stages of course development and implementation, description of its content and structural elements. The course was piloted in all UA universities, partnered with the MultiEd team, encompassing 583 participants, 466 of which successfully completed the course. This article focuses on the results of 194 participants’ training on the Moodle platform of Zaporizhzhia National University (March – November 2023), their progress, evaluation and critical remarks, and highlights the prospects of its use in the system of professional teacher training