Early childhood teachers and educational programs are expected to be the primary resources as children experience different and sometimes conflicting cultural contexts. Early educators can play a paramount role as young children move through fluid identities and start recognizing and navigating within and across spaces of cultural differences--e.g., between home cultures and the socially-dominant school culture. In this sense, we draw attention to a multi-year action research study, paying particular attention to the process whereby an early childhood teacher investigated, problematized, and challenged the nature of curriculum and practices in a diverse preschool classroom. We focus on the role of action research in fostering culturally-relevant teaching. As we do so, we analyze an early childhood teacher's shifting perceptions of what it means to engage in culturally-relevant teaching, respecting and honoring cultural diversities.