The teaching-learning process in a classroom is best understood through classroom observation. Classroom observation helps teachers to improve their teaching-learning quality. The purpose of the study was to observe the teaching-learning process inside the classroom. The study was qualitative in nature and used two rounds of classroom observations. Data were collected from 35 (20 male and 15 female) teacher participants in the school. The study was conducted at one higher secondary school under Thimphu Thromde, Bhutan. A non-probability convenient sampling technique was used for the study. The classroom observation data were analyzed using the process of emerging themes. The finding of the study revealed that teaching consists of chalk and talk method and teacher direct. Few students were found participating, involving, and questioning. A majority of teachers use lower-order thinking questions with few teaching-learning materials. Lesson plans do not address all components of the teaching-learning process. The findings recommend ensuring teaching-learning materials such as models, toys, and visual tools in the classrooms. There is a need for frequent professional development on content and pedagogical practices for teachers to raise the quality of teaching-learning. Teachers need to maintain a standard lesson plan with various components of lesson introduction, the procedure of carrying out activities, explaining concepts, ways of assessing learning, and student engagement techniques.