Project-based learning has drawn increasing attention from educators and researchers because of the multiple benefits it provides. Successful project-based learning engages students in deeper learning by using language as a tool to empower discoveries about the language itself, content, and various skills in authentic contexts. Using the revised version of Bloom’s Taxonomy as its analytical framework, this study examined whether project-based learning promoted EFL college students’ critical thinking and how students demonstrated their thinking skills through a book report project in a reading course.