Background/Context: A significant body of research on gender and sexual diversity in education has called on teachers to "move beyond inclusion" of LGBTQ+ voices in curriculum by queering their practice and "disrupting cis-heteronormativity." Few studies have focused on the ways that disrupting cis-heteronormativity is challenging work for teachers to engage. Purpose/Objective/Research Question/Focus of Study: In this case study, we focus on patterned moves that Laura, a first-grade teacher, made to disrupt cis-heteronormativity by supporting her students in cultivating what we call a "queer mindset"--a way of thinking, feeling, and doing that "rattles" her students' common sense. Research Design: The qualitative study reflects a nested case study design in which Laura represents an individual case within the broader case. Specifically, we use instrumental case study methodology. Conclusions/Recommendations: To make good on the goal of disrupting cis-heteronormativity, we encourage educators to cultivate in their students ways of thinking, feeling, and doing that upend common sense and that challenge the status quo. We encourage educators to support their students in developing queer mindsets. This way, not only can educators support individual students, but they can also propel the kind of social transformation we want to see.