The purpose of this study was to explore the effect of mindfulness coaching on preservice teachers' self-efficacy and mindfulness, utilizing a mixed-reality simulation environment. Data was collected via a concurrent embedded mixed methods design. This study involved a treatment group of preservice teacher participants that received mindfulness coaching and a comparison group of preservice teacher participants that did not receive mindfulness coaching, within a mixed-reality simulation environment. Each preservice teacher participant completed the Mindful Attention Awareness Scale to measure mindfulness and the Teachers' Sense of Efficacy Scale to measure self-efficacy as pretests and posttests. Participants were also interviewed. Findings were then analyzed and while there were no statistically significant quantitative results, qualitative analysis resulted in the following finding statement: Participating in a mixed-reality simulation environment influenced the teaching self-efficacy beliefs of preservice teachers and learning about mindfulness strategies while engaging in that process enabled preservice teachers to cope with in-the-moment stressors and consider ways to utilize mindfulness as classroom teachers. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]