It is a common occurrence in a timber framed structure to have two beams meeting at a single post. This can create conflicts with the joinery. A corner joint with screws is one solution to this problem. In order to avoid taking too much “meat” out of the lumber and weakening it, structural screws are a handy solution to reinforce the connection.
In this case, a traditional pegged mortise and tenon joint is created to secure the first beam to the post on the exposed (visible) side. With a clever notching technique, the second beam is strongly supported on the top of the post. Then three structural screws are routed into its upper (hidden) plane and discretely secure it into the framework.