This presentation will introduce a transformative blended learning model called In-Class Flipped Mastery. By leveraging instructional videos and online self-checks during class time, students can learn core concepts at their own pace. The teacher provides personalized guidance and feedback during class, supporting students individually as they demonstrate mastery of each topic. This mastery-based approach puts students in control of their learning while ensuring they receive the teaching and encouragement needed to deeply understand each concept. The result is dramatic academic gains, improved student confidence and agency, and more positive student-teacher relationships.