This workshop brings together researchers and practitioners in the mixed reality community to brainstorm how sensing the brain can be useful for VR/AR/XR applications. Topics of discussion are expected to broadly include how brain sensing can be used in VR (e.g., cybersickness, presence, cognitive load), what are the challenges in doing this type of sensing in VR/AR/XR (e.g., hardware constraints, movement, real-time analysis), how to do it responsibly (neurorights, privacy, anonymization, open datasets). A moderated panel discussion will seed ideas based on panelist perspectives. A poster session will allow participants to share their research and/or perspectives. Breakout discussions will allow for open exchange of ideas. The goal of this workshop is to create a research vision to inspire the community and to catalyze the exploration of a new scientific frontier.