STEM teachers are considered one of the most important factors in inspiring high school students in STEM to excite them about the dynamic nature of the STEM fields (PCAST, 2010). Increasing the number of qualified and diverse science and mathematics teachers, especially those working in high-need areas, is of paramount importance. The intention of this mixed methods study was to consider the ways in which a teaching-focused internship might impact an undergraduate STEM student's decision to consider entering the STEM teaching profession. Results indicated internships were an important recruitment tool for STEM majors to consider a career in science and/or mathematics teaching. Authors detail implications for supporting STEM interns at all points of their development as a teacher.