Elementary education teacher candidates identified four criteria they used to identify a "best" lesson plan they had developed and taught for posting to their electronic portfolio. Criteria include a lesson that students: liked, learned from, actively participated in, and were involved in carrying out research. Scoring with rubric focusing on guided inquiry instruction found 86% of the lessons were evaluated as best by investigators. Patterns of strengths and weaknesses within the lessons were also found. Electronic portfolios can be used to demonstrate candidates' conceptions of their best lesson and should be accompanied by commentary identifying the rationale for those conceptions.