While this isn't empirical, it laid the foundation and is incredibly practical.
Feldon, D. F. (2007). Cognitive load and classroom teaching: The double-edged sword of automaticity. Educational Psychologist, 42(3), 123-137. https://doi.org/10.1080/00461520701416173
It's worth noting that there's a lot of research happening, and findings are remarkably consistent from a CLT perspective
Citation TBD
It says "do not circulate," and I don't remember which corner of the internet I found the complete version.
However, everyone developing curriculum and teacher support resources should read this.
Gray-Lobe, G., Kremer, M., de Laat, J., & Wong, W. (2025). Details, Delegation, and Control The Impact of Streamlining Instructions to Teachers on Student Test Scores.