Across the United States, school districts have adopted various methods to capture what effective teachers do to facilitate student learning. Some of these methods include peer lesson studies where teachers co-plan and co-evaluate their work, examining student standardized tests scores to align teachers with student learning outcomes, and using a teacher observation protocol to examine in-class instructional practices and evaluate teachers. These methods have been used across the teaching profession with generalized student populations. The Danielson Group Framework for Teaching (FFT) is one observation protocol that has been used throughout the United States as a tool to examine teacher effectiveness in the context of teacher evaluations (Campbell & Ronfeldt, 2018, "American Educational Research Journal," 55, 1233). In its traditional form, the FFT protocol does not capture the specialized work of teachers of English learner (EL) students in mainstream inclusive classrooms. This article examines the modification and validation of an EL-modified FFT observation protocol across two of the four domains of the FFT. Findings demonstrate that the EL-modified FFT instrument is both valid and reliable as an observation tool for teachers of EL students in mainstream inclusive classrooms.