Is this overkill or not? Personally I think this is the easiest and strongest wood butt joint to make without buying expensive equipment. If there is a better way, let me know in the comments, otherwise, biscuit joint, pocket hole screws for the clamping power, and GLUE.
M12 Installation driver
https://amzn.to/3BVUGWk
Kreg Jig Pocket Hole
https://amzn.to/3BX6yHT