Best Method
Table Saw with a sled and a stop.
References
Reference
URL
The Secret To Perfect Half-Lap Joints
https://www.youtube.com/watch?v=kEND72BCrGE
3 Ways To Cut Half Lap Joints Like A Pro!
https://www.youtube.com/watch?v=hLnsgQ3xHjg
Building a Crosscut Sleds
https://www.youtube.com/watch?v=OqU73MN2avw