The purpose of this action research was to study the potential of block time lesson planning (BTLP) as a viable alternative to detailed daily lesson planning in managing teachers' workloads. The study delved into primary responsibilities of a teacher such as resourcing lessons, carrying out assessments and daily lesson planning as workloads. A combination of qualitative and quantitative methods was carried out with 40 teachers of Dagapela Middle Secondary School, in Dagana district of Bhutan. Quantitative data was gathered through online survey questionnaires while qualitative data was obtained through semi-structured interviews and participant observations. Results demonstrate that BTLP addressed teachers' workload by creating time to resourcing lessons with teaching learning materials (TLM) and for assessment of student works. We conclude that the BTLP as an alternative to detailed daily lesson planning can help in managing teachers' workload while creating time to concentrate on teaching learning materials (TLM) and assessment routines.